And you say, well, OK, let's think about their rotational motion.
然后你说，好，让我们来考虑它们的转动。
That red tattoo is called a heel whip, and it's from excessive rotational motion of your foot.
那一道红印被称作脚跟鞭伤，是您的脚过度旋转造成的。
One way to see this is to compare the energy of a nuclear blast to that of the rotational motion of the Earth.
有一种方法可以说清楚这个问题：即把核爆炸的能量与地球转动的能量作一次比较。
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