JG: And lastly, here's Destin, from "Smarter Every Day," talking about the conservation of angular momentum, and, since it's YouTube, cats:  Hey, it's me, Destin. Welcome back to "Smarter Every Day."
JG：最后是《每天聪明一点点》的 德斯丁， 为我们讲述动量守恒， 由于是在YouTube上， 所以他用猫来举例： 嗨，我是德斯丁， 欢迎再次收看《每天聪明一点点》。