宇宙飞船正绕月球飞行。

The spacecraft is orbiting the moon.

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于是，国家航空和航天局的飞行指挥员告诉他们准备“飞向”月球。

So, the NASA flight director told them they were "go" for the moon.

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该航天器在绕月球轨道上飞行。

The spacecraft is in orbit (ie moving in orbit) round the moon.

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该航天器在绕月球轨道上飞行。

The spacecraft is in orbit (ie moving in orbit) round the moon.

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