When P, mouth without compressed air, in spring force and A mouth (chamber) under the action of more than strength;

当P 口无压缩空气时，在弹簧力和A 口（腔） 余气力作用下；

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The compressed spring when force is removed, returns to its original position, the distance that a spring compressed under force depends on the rate of the spring.

当压紧力撤除时，被压紧的弹簧恢复到初始状态，在压力作用下，弹簧的压缩变形量取决于该弹簧的刚度。

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If you connect the body to a spring, which is neither compressed nor extended, there's no force acting on it.

如果将一个弹簧连在这个物体上,弹簧既没有被压缩也没有被拉伸,也不会有力作用在它上面

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