4.The spacecraft will (圍繞) the moon twice.

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   It seems to us that the earth stands quite stilK 靜止的) . But it is really m l all the time. It turns around a makebelieve (虛幻的) line t 2 its center. We call this make-believe line the earth’s axis (地軸) . The two e 3 of the earth’s axis are called its poles (極) . The earth travels twentyfour hours around its axis o 4 .

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