Los mejores videos

Teacherflix
14 vistas · 2 años hace

This calculus video tutorial provides a basic introduction into the mean value theorem. It contains plenty of examples and practice problems that show you how to find the value of c in the closed interval [a,b] that satisfies the mean value theorem. For the mean value theorem to be applied to a function, you need to make sure the function is continuous on the closed interval [a, b] and differentiable on the open interval (a, b).

Introduction to Limits:
https://www.youtube.com/watch?v=YNstP0ESndU

Derivatives - Fast Review:
https://www.youtube.com/watch?v=5yfh5cf4-0w

Introduction to Related Rates:
https://www.youtube.com/watch?v=I9mVUo-bhM8

_____________________________
Extreme Value Theorem:
https://www.youtube.com/watch?v=Sx2lPZlnWfs

Finding Critical Numbers:
https://www.youtube.com/watch?v=Bp9EbV3COVA

Local Maximum & Minimum:
https://www.youtube.com/watch?v=WCq3sRzsJfs

Absolute Extrema:
https://www.youtube.com/watch?v=3wrXDw5ETh4

Rolle's Theorem:
https://www.youtube.com/watch?v=LHym1ARc2cE

________________________________
Mean Value Theorem:
https://www.youtube.com/watch?v=SL2RobwU_M4

Increasing and Decreasing Functions:
https://www.youtube.com/watch?v=Dyl7jPlJXOM

First Derivative Test:
https://www.youtube.com/watch?v=G5wlKltW7pM

Concavity & Inflection Points:
https://www.youtube.com/watch?v=OhqNbQi9QPk

Second Derivative Test:
https://www.youtube.com/watch?v=G8GAsYkZlpE

_________________________________
L'Hopital's Rule:
https://www.youtube.com/watch?v=Gh48aOvWcxw

Curve Sketching With Derivatives:
https://www.youtube.com/watch?v=JTVNUdL7sWs

Newton's Method:
https://www.youtube.com/watch?v=-5e2cULI3H8

Optimization Problems:
https://www.youtube.com/watch?v=lx8RcYcYVuU

_______________________________________
Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

Teacherflix
27 vistas · 3 años hace

Educational video for children to learn about the human ear and its parts: the outer ear, the middle ear and the inner ear. Children will learn a lot of new words like: eardrum, cochlea, stirrup and many more. Do you know what the Eustachian Tubes are? Find out about them and let's learn the senses together.

This video is belongs to a Science video collection for kids, to learn in a fun way. Excellent resource for elementary education.

Thanks for visiting us! If you want your children to smile and learn, subscribe! :D

We only upload our own content, designed by educators so that children smile and learn while watching a video.

All of our content reinforces educational values, encouraging the use of multiple intelligences and language learning.

If you like our videos, download “The Smart Library” now. You’ll discover more than 70 interactive games and stories for children designed by educators. The stories are based on VALUES like friendship, respect, and generosity, and our games cover all of the MULTIPLE INTELLIGENCES. All our content is in SPANISH, ENGLISH, FRENCH, ITALIAN and PORTUGUESE.

Teacherflix
4 vistas · 11 meses hace

It’s really warm outside, a perfect day to go for a swim! Have fun singing and dancing along, and learn some basic swimming skills along the way!
Subscribe for new videos every week: https://www.youtube.com/c/coco....melon?sub_confirmati

Lyrics:

I Jump in the water, we’re going for a swim
It’s a hot sunny day, so come on, let’s all get in
It’s always so much fun to go swimming in the pool
So let’s jump in the water, it’s nice and cool

Let’s jump in do do do do do do
Let’s jump in do do do do do do
Let’s jump in do do do do do do
Let’s jump in

Hold my breath do do do do do do
Hold my breath do do do do do do
Hold my breath do do do do do do
Hold my breath

Kick my legs do do do do do do
Kick my legs do do do do do do
Kick my legs do do do do do do
Kick my legs

Move my arms do do do do do do
Move my arms do do do do do do
Move my arms do do do do do do
Move my arms

Float along do do do do do do
Float along do do do do do do
Float along do do do do do do
Float along

Blow some bubbles do do do do do do
Blow some bubbles do do do do do do
Blow some bubbles do do do do do do
Blow some bubbles

About Cocomelon:

Where kids can be happy and smart!

At Cocomelon, our goal is to help make learning a fun and enjoyable experience for kids by creating beautiful 3D animation, educational lyrics, and toe-tapping music.

Kids will laugh, dance, sing, and play along with our videos, learning letters, numbers, animal sounds, colors, and much, much more while simply enjoying our friendly characters and fun stories.

We also make life easier for parents who want to keep their kids happily entertained, giving you the peace of mind that your children are receiving quality educational content. Our videos also give you an opportunity to teach and play with your children as you both watch!

WEBSITE: http://www.Cocomelon.com
FACEBOOK: https://www.facebook.com/Cocomelonkids
INSTAGRAM: https://www.instagram.com/cocomelon/
TWITTER: https://www.twitter.com/Cocomelonkids


Copyright © Treasure Studio, Inc. All rights reserved.

Teacherflix
27 vistas · 3 años hace

Gases are everywhere, and this is good news and bad news for chemists. The good news: when they are behaving themselves, it's extremely easy to describe their behavior theoretically, experimentally, and mathematically. The bad news is they almost never behave themselves.
In this episode of Crash Course Chemistry, Hank tells how the work of some amazing thinkers combined to produce the Ideal Gas Law, how none of those people were Robert Boyle, and how the ideal gas equation allows you to find out pressure, volume, temperature, or number of moles. You'll also get a quick introduction to a few jargon-y phrases to help you sound like you know what you're talking about.

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

Download it here for Apple Devices: https://apple.co/3d4eyZo
Download it here for Android Devices: https://bit.ly/2SrDulJ

Table of Contents
Ideal Gas Law Equation 0:50
Everyone But Robert Boyle 1:35
Ideal Gas Law to Figure Out Things 6:16
Jargon Fun Time 7:46

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

Want to find Crash Course elsewhere on the internet?
Facebook - http://www.facebook.com/YouTubeCrashCourse
Twitter - http://www.twitter.com/TheCrashCourse
Instagram - https://www.instagram.com/thecrashcourse/

CC Kids: http://www.youtube.com/crashcoursekids

Teacherflix
22 vistas · 3 años hace

In this video you will learn how to read maths symbols and equations in English and improve your maths vocabulary ( or math vocabulary). You will learn how to read addition, subtraction, multiplication and division equations as well as how to read equations involving brackets, fractions, decimals, square roots and the exponents. You will also learn how to read “greater than”, “smaller than” “is not equal to”, “greater than or equal to”, “smaller than or equal to” or the “approximately equal to” signs and many more ( ≈ ÷ ≠ √ ≤ ≥ × - = + ). You will also learn the difference between math and maths, two short forms for mathematics. There is a test at the end so stay tuned.

Subscribe for more whiteboard animations on English Grammar and words origin
https://www.youtube.com/channe....l/UCdEq3aNyMi2YY4YZy
?sub_confirmation=1

#learnenglishwithtonguemation#mathsenglishvocabulary

Share this video with a friend:

https://youtu.be/STmx4vV5md8

Chapters
0:00 Intro
1:06 Math or Maths - which one is correct?
1:48 How to read Addition equations (+)
2:42 How to read Subtraction equations (-)
3:21 How to read Multiplication equations (x)
4:00 How to read Division equations (÷)
4:35 How to read equations with brackets ()
5:02 Alternative to the Equals sign (≈ ≠ ≤ ≥ etc.)
6:21 How to read Fractions (1/2)
7:06 How to read Decimals (0.00)
7:55 How to read Square roots (√)
8:48 How to read Exponents
9:30 The Test
10:50 Outro

Teacherflix
106 vistas · 2 años hace

This physics video tutorial explains how to solve any circuit problem with capacitors in series and parallel combinations. This video explains how to calculate the electric charge and voltage on every capacitor in a series and parallel circuit. In a series circuit, the capacitors have the same charge and the voltages are additive following kirchoff's voltage law. In a parallel circuit, all of the capacitors have the same voltage but their charges are additive. This tutorial contains plenty of examples and practice problems.

Capacitors - Basic Introduction:
https://www.youtube.com/watch?v=BimpNou0orc

How To Solve DC Circuits:
https://www.youtube.com/watch?v=eFlJy0cPbsY

KCL and KVL Circuit Analysis:
https://www.youtube.com/watch?v=2Zu3ppq3n8I

Equivalent Capacitance:
https://www.youtube.com/watch?v=PPhSmZ6w9WY

Capacitors In Series and Parallel:
https://www.youtube.com/watch?v=zaT4JorVUz0

__________________________
More Example Problems:
https://www.youtube.com/watch?v=a-gPuw6JsxQ

Electron Flow In Capacitors:
https://www.youtube.com/watch?v=iQZknlJjaj4

RC Circuit Physics Problems:
https://www.youtube.com/watch?v=PLQrPqYlPmI

Voltmeters and Ammeters:
https://www.youtube.com/watch?v=NLPSHwDUYrY

Wheatstone Bridge Circuit:
https://www.youtube.com/watch?v=jFvVtB10B1I

______________________________
Basic Electronics For Beginners:
https://www.youtube.com/watch?v=uXr4lXYjXuU

Magnetic Force on a Wire:
https://www.youtube.com/watch?v=nv28Cp-ILJ0

Magnetic Force on a Moving Charge:
https://www.youtube.com/watch?v=7MBawzone30

The Homopolar Motor:
https://www.youtube.com/watch?v=6Oj4qvCR6ow

Physics PDF Worksheets:
https://www.video-tutor.net/ph....ysics-basic-introduc

Teacherflix
19 vistas · 2 años hace

Thousands of parents and educators are turning to the kids’ learning app that makes real learning truly fun. Try Kids Academy with
3-day FREE TRIAL! https://bit.ly/2GuGyL2

Welcome our new video: Letter C Alphabet - Learn the Alphabet | Phonics. Subscribe to our channel: https://goo.gl/iG2Bdr

Check our new videos of learning alphabets funny and interactive.

#TalentedAndGifted #LearnWithKidsAcademy

Kids Academy Talented and Gifted Program for kids aged 2-10:

Subscribe to our channel: https://goo.gl/iG2Bdr

*****

Connect with us on :

App Store: https://smart.link/59833db06a6b8
Google Play: https://smart.link/597210af6eb83

Our website: http://www.kidsacademy.mobi
Facebook: https://www.facebook.com/KidsAcademyCompany
Twitter: https://twitter.com/KidsAcademyCo

What is learning?

How can you make learning easier and fun, especially for kids? How can you develop their interest in acquiring new things? Well, if you really want to dig into the details of these questions make sure you read on.

What is learning?

Learning is basically acquiring knowledge, new skills, behaviors, preferences, and values. Nelson Mandela once said:
Education is the most powerful weapon which you can use to change the world”.

So, basically learning and educating is something everyone needs to do for sure. Now let’s move on to the next question.
How to make learning easier for kids?

There are several different techniques highly suggested by the educational psychologists which certainly makes learning easier for kids. Here are a few tips.
• Make them watch interesting and related videos.
• Use images and pictures more to explain and elaborate a little better.
• Choose a quiet place when learning.
• Take breaks in between lecture so the kids aren’t exhausted.
• Make sure the kids are fresh and listening carefully.

Now, off to the third question.

How can you develop their interest in learning?
Okay, so this is mainly the hard part. Developing the interests is the most challenging and daunting task. Even though there are some kids who are interested in learning new things on their own but a few require some extra attention, most of the time. There are few tips which can make developing the interest of children a lot easier.

Have a look:
• Use a lot of attracting colors, puppets, and flashcards to develop their interest in learning.
• Videos can also make learning more interesting.
• Pictures and slideshows can also help in developing children interest.

The Letter C:

Alphabets are the first thing taught in school and trust me it’s quite grueling and strenuous. Why? Well, because it’s not only about memorizing the alphabet. You need to help them make different sounds of the alphabet, help them write it, pronounce it, make words out of it and then use it in the sentence. But obviously you don’t do it all at once, right?

The initial step is to make them learn to read, pronounce and write the alphabet. Let’s discuss how to pronounce the letter C.
Letter C is the third alphabet in the ABC’s. Everyone is quite of that I’m sure. So let’s stick on to this word and figure out how to learn it easily.

Learn Letter C:

Okay, so we have already learned the different ways which can help make learning easier. One of the best ways is to put on images, flashcards, and most importantly videos. Videos not only help in developing an interest in learning but also assists in remembering and recalling the alphabets. Making children watch videos is best for children who have a problem with concentration and do not pay attention.

How to learn the Letter C?

Pronunciation of the letter is most important. Obviously, there is more than one way to pronounce the letter C. To make that easier playing a video which not only helps the kids in recognizing the alphabet but also helps in pronouncing the different sounds made by the alphabet.

Here is why learning from a video is better.
• Visual processing
• Learning through demonstrations
• Contextualization
• Illustrations

Visual Processing:

The human brain, especially children’s, is dedicated more towards the visual processing. Since, the brain responds to visuals first, therefore, learning through videos help in grasping the idea (of what is being taught) better. Recalling and memorizing stuff from the videos and pictures (for kids) retains in mind for a longer duration of time, therefore it is always better to make children learn through videos and pictures first before you switch to copy and pencil.

Learning through demonstrations:

Learning for children through demonstrations is always better. Since it requires just watching and paying attention rather than making any effort, therefore, it is better to make children learn this way.

Teacherflix
10 vistas · 11 meses hace

Everybody’s making mashed potatoes! It takes a lot of work, but we’ll have fun counting along the way, and have a yummy snack when we’re done! Have fun singing and counting together!
Subscribe for new videos every week: https://www.youtube.com/c/coco....melon?sub_confirmati

Lyrics:

One potato, two potatoes
Three potatoes, four

Five potatoes, six potatoes
Seven potatoes more

About Cocomelon:

Where kids can be happy and smart!

At Cocomelon, our goal is to help make learning a fun and enjoyable experience for kids by creating beautiful 3D animation, educational lyrics, and toe-tapping music.

Kids will laugh, dance, sing, and play along with our videos, learning letters, numbers, animal sounds, colors, and much, much more while simply enjoying our friendly characters and fun stories.

We also make life easier for parents who want to keep their kids happily entertained, giving you the peace of mind that your children are receiving quality educational content. Our videos also give you an opportunity to teach and play with your children as you both watch!

WEBSITE: http://www.Cocomelon.com
FACEBOOK: https://www.facebook.com/Cocomelonkids
INSTAGRAM: https://www.instagram.com/cocomelon/
TWITTER: https://www.twitter.com/Cocomelonkids


Copyright © Treasure Studio, Inc. All rights reserved.

Teacherflix
144 vistas · 2 años hace

Martin Cisneros - Twitter: https://twitter.com/sjsulurie - Director of Technology Services in the Berryessa Union School District, led this conversation:

Need to enhance your distance learning game? Are your students tired of digital sit and get, consumption programs, and bored with just text activities? Then this learning experience if for you! This session involves teachers everywhere to use technology to engage learners and amplify the learning experience in classrooms. Learn to focus on pedagogy first, and then CREATE LEARNING EXPERIENCES on the purposeful and engaging use of technology!

Intended audience: Those who teach grades K-12

The SJSU Lurie College of Education has established this free K-12 Online Teaching Academy to support pre-service teacher candidates and current teachers to strengthen their online teaching skills and adapt to our current circumstances. Learn more about the academy at sjsu.edu/education/k12-academy

Connect with Lurie College at https://linktr.ee/sjsulurie to receive more news about academic and student life!

Teacherflix
26 vistas · 3 años hace

#partialfractionmethod #partialfractions #fractions
This precalculus video tutorial provides a basic introduction to partial fraction decomposition. Partial fraction decomposition is the process of taking a complex fraction and breaking it into multiple simpler fractions. It's the reverse of adding or combining two fractions into a single fraction.
This is the second video which will be followed by others

Teacherflix
16 vistas · 4 meses hace

Up until now, you’ve been writing custom code to give AI access to your data. But that might not be needed for much longer.

Anthropic’s newly introduced solution, MCP (Model Context Protocol), is set to change the game for good.

MCP acts as a universal bridge between your data and AI, offering a plug-and-play approach that eliminates the need for custom integrations. Whether it’s your databases, APIs, or documents, MCP standardizes how AI models interact with your specific datasets.

If this innovation gets the adoption it deserves, we’ll soon be able to have AI seamlessly interact with our data—with no custom coding required.

Learn more about MCP and its potential to simplify AI integrations:
👉 Anthropic’s Official MCP Announcement: https://www.anthropic.com/news..../model-context-proto

👉 More on MCP: https://modelcontextprotocol.io/quickstart

#AIIntegration #AnthropicMCP #FutureOfAI #AIExplained #aiwithsupreet #mcp #anthropic #claude

Teacherflix
25 vistas · 11 meses hace

Discover hundreds of never-before-seen resources! Create your free account at https://my.happylearning.tv/ and start learning in the most entertaining way.

What are you waiting for? Today we are going to rock out to the Alphabet song!
Sing it along and learn your ABC's with us. Enjoy!

Visit www.happylearning.tv

Teacherflix
8 vistas · 12 meses hace

Hola a todos, hoy les traigo un video de como hacer una piramide en geogebra clasico, de una manera sencilla, (este video lo hago por que es para una tarea :v)
---------------------------------------------------------------------------------------------------------------------------



Mis redes sociales :O
instagram: https://www.instagram.com/juanbelta/?hl=es-la
twitch;https://www.twitch.tv/juan_bel_

Perfil de roblox:https://www.roblox.com/users/485390092/profile

Teacherflix
149 vistas · 2 años hace

In todays video we look at Chinas version of o1 and more details on ChatGPT Operator.

Links:
https://chat.deepseek.com/
https://api-docs.deepseek.com/quick_start/pricing/
https://deepmind.google/techno....logies/gemini/flash-
https://www.perplexity.ai/hub/....blog/introducing-the
https://runwayml.com/worlds-of-frames
https://klingai.com/release-notes
https://lumalabs.ai/ray
https://huggingface.co/spaces/tencent/Hunyuan3D-2


Chapters:
0:00 What’s New?
0:31 DeepSeek-R1
3:44 Sam Altman’s Tweet
4:47 ChatGPT Operator & o3-mini
7:54 Gemini 2.0 Flash Thinking Experimental
8:42 Perplexity Sonar
9:40 Runway Frames
12:10 Kling AI Elements
12:48 Luma AI Ray2
13:56 Hunyuan 3D Generator
15:04 Message for Viewers

#ainews #newsyoucanuse

Free AI Resources:
🔑 Get My Free ChatGPT Templates: https://myaiadvantage.com/newsletter
🌟 Receive Tailored AI Prompts + Workflows: https://v82nacfupwr.typeform.com/to/cINgYlm0
👑 Explore Curated AI Tool Rankings: https://community.myaiadvantag....e.com/c/ai-app-ranki
🐦 Twitter: https://twitter.com/TheAIAdvantage
📸 Instagram: https://www.instagram.com/ai.advantage/

Premium Options:
🎓 Join the AI Advantage Courses + Community: https://myaiadvantage.com/community
🛒 Discover Work Focused Presets in the Shop: https://shop.myaiadvantage.com/

Teacherflix
16 vistas · 3 años hace

Learn about the structure of the federal executive branch, or the President of the U.S.!
We hope you are enjoying our large selection of engaging core & elective K-12 learning videos. New videos are added all the time - make sure you come back often to learn more! If you’d like us to cover any additional topics, please let us know.
For practice, assessment, and many interactive activities that go along with each video, as well as a teacher/parent dashboard, go to Miacademy.co for Grades K-8 or Miaprep.com for grades 9-12!

Teacherflix
8 vistas · 3 años hace

TeacherTube User: Steventwilliams

TeacherTube URL: http://www.teachertube.com/vie....wVideo.php?video_id=

This is a math video lesson to help you with new math, math tricks, and or simple math questions you may have.

This video explains why the elimination method for solving systems of equations actually works.

Teacherflix
20 vistas · 5 meses hace

Creating presentations from mind maps usually requires manual structuring, organizing ideas, and designing slides. But with AI tools, the entire process can now be done much faster.

In this video, you’ll learn how to convert mind maps into complete presentations for free using NotebookLM and Google Gemini.

This AI workflow helps you transform brainstorming ideas, research notes, and mind maps into structured presentation slides in just a few minutes.

In this tutorial, you’ll learn how to:

• Convert a mind map into structured content
• Use NotebookLM to organize ideas and insights
• Generate presentation-ready content using Gemini
• Transform brainstorming notes into slide outlines
• Create clear and structured presentations quickly

This workflow is perfect for students, teachers, researchers, educators, and professionals who want to turn ideas into presentations without spending hours organizing content.

If you're looking for a fast and free way to convert mind maps into presentations using AI, this tutorial will show you the complete step-by-step process.

#NotebookLM #GeminiAI #AIPresentations #MindMapping #AITools

Teacherflix
39 vistas · 2 años hace

Sponsored by World of Warships! Click here → https://wo.ws/3SBK2Mz and register to receive 500 doubloons, 1,500,000 Credits, free ship, and 7 days premium time when you use code BRAVO. Applicable to new users only!

Check out our other Channel: https://www.youtube.com/@simplehistory2
Become a Simple History member: https://www.youtube.com/simplehistory/join
Support us on Patreon: https://www.patreon.com/simplehistory

The nightmares of Allied cargo shipping, the German U-Boats reigned supreme in the turbulent seas during 1940-1942. Taking one of these U-Boats as an example, the U-505 submarine sunk an impressive 8 ships and yet still was below the devastating 14:1 average of the early war years. But what did life look like beneath the 1,120 t exterior?

Copyright: DO NOT translate and re-upload our content on Youtube or other social media.

SIMPLE HISTORY MERCHANDISE

Get the Simple History books on Amazon:

https://www.amazon.com/Daniel-....Turner-%60/e/B00H5TY

T-Shirts

https://teespring.com/stores/s....imple-history-offici

Simple history gives you the facts, simple!

See the book collection here:

Amazon USA

http://www.amazon.com/Daniel-Turner/e/B00H5TYLAE/


Amazon UK
http://www.amazon.co.uk/Daniel....-Turner/e/B00H5TYLAE


https://www.facebook.com/Simpl....e-History-5494376751

https://twitter.com/SimpleHistoryYT


Credit:
Show Created by Daniel Turner (B.A. (Hons) in History, University College London)
Script: Robert de Graaf
Narrator:

Chris Kane
https://vocalforge.com/

Dear, I.C.B. and M.R.D Foot, editors. The Oxford Companion to World War II. Oxford: Oxford University Press, 1995.

“Type IX U-boat.” Uboataces.

“U-Boat types: Type IXC.” Uboat.

“U-boat: U-505 (Type IXC). Militaryfactory.

“Life Aboard a U-boat.” Uboataces.

”75 Facts about U-505: Life on Board” Museum of Science and Industry.

Teacherflix
3 vistas · 2 años hace

Introduce my PET | English Speaking | https://youtu.be/h36ebZH01nE
-----------------------------------------------------------------------------------
Please SUBSCRIBE to our channel, LIKE, and SHARE to encourage us to share more useful and interesting knowledge.
請訂閱我們的頻道、點讚、分享,鼓勵我們分享更多有用又有趣的知識。
-----------------------------------------------------------------------------------
Welcome to watch our videos
歡迎觀看我們所創作的的其他影片
1)Basic Conversation 會話
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

2) Grammar 語法
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

3)English Speaking
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

4)Funny Jokes 笑話
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

5)Vocabulary 詞彙
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

6)English Idioms 英語成語
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

7)Revision Exercise 重温練習
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

8)Fun Games 趣遊戲味
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

9) Tongue Twister 繞口令
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

10)Writing a composition 作文
https://www.youtube.com/playli....st?list=PLPoPxSDq_eP

-----------------------------------------------------------------------------------
Please SUBSCRIBE to our channel, LIKE, and SHARE to encourage us to share more useful and interesting knowledge.
請訂閱我們的頻道、點讚、分享,鼓勵我們分享更多有用又有趣的知識。
-----------------------------------------------------------------------------------




Showing 1 out of 6