The instant polar movement has backward movement (from east to west).

瞬时极移存在反向运动(由东向西)。

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Recoil mechanism is the crucial part which controls the backward movement of a gun.

驻退机是反后坐装置中控制火炮后坐规律的关键部件。

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Forward and backward movement, meanwhile, was a bit harder to coordinate because of the lag time half way around the globe, Mr. Garriott DE Cayeux says.

理查德说，不过由于横跨近半个地球的时间滞后问题，前后滑动的动作有点难以协调。

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Though there are many signs that health care is moving toward increased transparency, there is also some movement backward.

WSJ: How to Stop Hospitals from Killing Us