Mechanics deals with such ideas as inertia, motion force and energy.

力学研究诸如惯性、运动、力和能量之类的概念。

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The force is always perpendicular to the direction of motion.

因为这个力总是垂直,于运动的方向。

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In particular, a force field with no curl is a force field that does not generate any rotation motion.

特别地，一个没有旋度的力场，就是一个不产生任何旋转运动的力场。

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