单词：critical angular momentum
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And lastly, here's Destin, from Smarter Every Day, 最后是《每天聪明一点点》的德斯丁， talking about the conservation of angular momentum, and, since it's YouTube, cats: 为我们讲述动量守恒，由于是在YouTube上，所以他用
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Im 30 years old, and there are several things that life has taught me that I want to share with you. Some of these things Ive known since I was young, some of these things I have learned recently. 我现在30岁了，我想和大家分享一下这些年
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素材来源：《狗狗旅馆》 寄人篱下的姐弟俩为不能继续养自己的爱犬而烦恼，机缘巧合之下他们发现了一栋被废弃的旅馆，并结识了宠物店工作的戴夫和海瑟，他们四个一起联手，偷偷打造狗
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