1、
Precession basically is the change in the direction of earth's axis of rotation.
旋进基本上是地轴旋转方向的变化。
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2、
3、
Unbalance means the non-uniform distribution of the mass of a rotor about its axis of rotation.
不平衡是指转子相对于其旋转轴质量分布不均匀。
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4、
For the moment of inertia, we want the square of a distance to the axis of rotation.
至于转动惯量，要求的其实是到旋转轴距离的平方。
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