作用力等于反作用力，这是牛顿第三定律，因此Fij与Fji完全相等，但它们方向相反。
Actions equals minus reactions, according to Newton's Third Law, so this force, Fij, will be exactly the same as Fji, except in the opposite direction.
第三运动定律是：作用引起反作用，这些作用大小相等和方向相反。
The third law of motion is that action causes a reaction and that these are equal and opposite.
这是牛顿第三定律的意义：对于每一个作用力总是有其大小相等的反作用力。
This is the meaning of Newton's Third Law: there is always an equal reaction to every action.
这是牛顿第三定律的意义：对于每一个作用力总是有其大小相等的反作用力。
This is the meaning of Newton's Third Law: there is always an equal reaction to every action.
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