词典释义：
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转速；旋转速度；转动速度
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转动惯量；旋转惯性；转动惯性
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The rotational motion of the Earth causes what we call "night" and "day".
地球的旋转运动导致了我们所说的黑夜和白天
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For an object to be in rotational equilibrium about a certain point, the total torque about this point must be zero.
一个物体若要在某一点处处于转动平衡，在这一点处的总力矩必须为零。
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Rotational energies are small.
转动能量很小。
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And that's a rotational degree of freedom.
那是一个旋转自由度。
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Linear molecules, I have kT of rotational energy.
线性的分子，我有kT的转动能。
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There's also rotational disorder if it's a molecule.
如果是分子也会有旋转无序。