Gravity is one force that acts on a body without the source of the force actually touching it.
引力是一种受力物体收到了力的作用,但却没有接触施力物体的力
Whenever there is a force, it can be traced back to a tangible material cause, which is all the time a force of contact, with the exception of gravity.
如果有作用力,那它一定能找到一个明确的实体施力物体,也就是无论何时物体受的都是接触力,引力除外
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