Earth-moon relation 地月关系
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A packet of butter has a gravitational pull of its own, but this is very small in relation to the pull of something as large as the moon or the earth or the sun.
一包黄油有本身的万有引力，但是这与像月球、地球或太阳那么大的物体的引力相比，就显得微不足道了。
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