The reactions(forces)on each sphere were equal and opposite and directed along the diameter through the point of contact . 每个球上的反作用（力）大小相等方向相反，其作用方向沿着通过接触点的直径。
Since the law says that for every action there is an equal and opposite reaction, all forces add up to zero . 由于这个定律说：对于每一个作用，都存在着一个大小相等而方向相反的反作用，从而全部力的总和应等于零。
Where there is action , there is reaction 哪里有作用，哪里便有反作用。
. . . and electrolytic reduction reverses the process 电解过程会起反作用
I do think that every action creates reaction 我认为作用产生反作用。
And electrolytic reduction reverses the process 电解过程会起反作用
This reaction information can not be deleted 反作用是不可消除的。
What was the reaction of the rocket 火箭的反作用如何发生效的？
His plan to reduce the number of workers boomeranged on him 他想要裁减工人的计划对他起了反作用。
