除非有一合力作用于物体上，否则物体的方向是不会发生变化的。
There is no change in the motion of a body unless a resultant force is acting upon it.
中央银行制度变迁是经济主体行为合力作用的结果。
The central bank institutional changes result from the composite force of the economic subject's performance.
学术权力及其有效地运行是各相关要素共同合力作用的结果。
Scholastic power and its valid operation results from the joint function of all relative factors.
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