In the end, you cannot have the first without the second.
最后，如果没有第二个，第一个也无从说起。
One body never exerts a force on another without the second reaction against the first.
一个物体对另一个物体施加力，从来不会不受到后者的反作用力。
One body never exerts a force on another without the second reaction against the first.
一个物体对另一个物体施加力，从来不会不受到后者的反作用力。
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