调整屏幕的大小
Resize out
Resize in
Resize 重置
Done 完成
Crush-Crush, Fizz-Fizz

Crush-Crush, Fizz-Fizz

观看次数1,101

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视频说明

How can you use mathematics (and a hammer) to make an effervescent tablet dissolve? Let Mr. O show you how surface area and volume interrelate!

分类： 热门免费线上视频标签儿童
插件 23 Feb 2017
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