For example, no matter how much a dancer wishes to leap off the floor and then start turning, the law of conservation of angular momentum absolutely prevents such a movement.

例如，无论一个舞者多么想要跳离地板，然后开始旋转，角动量守恒定律绝对阻止这样的动作。

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Now we're going to apply for the first time in systems like this, the conservation of angular momentum.

这是我们第一次，在这种系统里使用，角动量守恒定律。

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The law of conservation of angular momentum may be demonstrated with a gyroscope.

角动量守恒定律，可以用回转器来演示。

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This is because of conservation of angular momentum, the same property that causes ice skaters to spin faster if they draw their arms in.

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