The old man told his grandson that the moon moves around the earth.
老人告诉他的孙子月亮绕着地球转。
The earth moves around the sun while the moon moves around the earth.
地球绕着太阳转而月亮绕着地球转。
The moon's orbit is elliptical rather than perfectly circular, so as the moon moves around the Earth it is sometimes a little bit closer and sometimes a bit further away from us.
月亮绕地球运行轨道为椭圆形而非正圆。所以月亮绕地球运动的过程中，有时月亮会离地球近一些，而有的时候离地球远一些。
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