地心引力的英文定义是什么?

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地心引力的英文定义是什么?
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地心引力的英文定义是什么?
地心引力的英文定义是什么?

地心引力的英文定义是什么?
Gravity:The natural force of attraction exerted by a celestial body,such as Earth,upon objects at or near its surface,tending to draw them toward the center of the body.