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。
As another example the center of mass of the earth and moon moves in an approximately circular orbit around the sun.
作为另一个例子，地球和月亮的质心就是在一个绕太阳的近似的圆轨道上运行。
A satellite moves around a planet, for example, the moon is a satellite of the earth.
卫星绕着行星运转，例如，月亮是地球的一颗卫星。
That the moon moves round->around the earth is ordinary sense.
月球绕地球运行乃是常识。
The earth moves around the sun, and the moon moves round the earth.
地球绕着太阳转，月亮围着地球转。
The earth moves around the sun, and the moon moves round the earth.
地球绕着太阳转，月亮围着地球转。
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