Each moon has one side that faces toward its parent planet, while the other side faces away.

每个卫星都有一面面向它的主恒星，而另外一面远离其主恒星。

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And conversely, Earth's gravity has slowed the moon's rotation so that it always presents the same face to its parent planet.

反过来，地球的引力减慢了月球的自转速度，结果月球总是将其相同的一面展现给地球。

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Our moon and Jupiter's moons share a common characteristic. Each moon has one side that faces toward its parent planet, while the other side faces away.

月球与木星的卫星有一个共同的特征，每一颗卫星都只有一面面向环卫母星，另一面背离。

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