科学家能准确地计算出太空船什么时候抵达月球。

The scientists are able to calculate accurately when the spaceship will reach the moon.

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地面的接收器将利用卫星上的时间信号准确地计算出它们的方位。

Receivers on the ground will use time signals from the satellites to precisely calculate their 14 location.

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这一次它们可以重新计算出行步数，因此也就可以准确地计算出返程的步履了。

Now that they could re-count their outbound journeys, they were able to calculate the journey home.

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