Precession, basically is the change in the direction of earth's axis of rotation.

岁差，基本上是地球自转轴方向的改变。

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The axis of rotation and its support are part of the central pedestal.

旋转轴和它的支撑结构是中央操作台的一部分。

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Let's say we do rotation about the X-axis.

也就是绕x轴旋转。

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Let's say we do rotation about the X-axis.

也就是绕x轴旋转。

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