瞬时极移存在反向运动(由东向西)。

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

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其轨迹主要是由东向西！

The trajectory is primarily from east to west!

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那位记者说他看见UFO时，它正由东向西飞行。

The reporter said that the UFO was travelling east to west when he saw it.

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who went and found this river that flows east to west.

他们找到了这条由东向西流的河。

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