Again, we have to use now the parallel axis theorem.

现在我们要用，平行移轴定理。

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And now there is a theorem which I will not prove, but it's very easy to prove, and that is called the parallel axis theorem.

这个公式，我不会再验证了，但它很容易证明，它称为，平行轴定理。

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Conservation of angular momentum, moment of inertia, parallel axis theorem.

角动量守恒，惯量，平行轴原理。

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