The net effect on the piston of all these small irregular forces must be equal to that of the force of gravity if there is to be equilibrium.
假使两方面保持平衡，那么所有这些小的不规则的力对活塞的有效作用必须与重力相等。
The net effect on the piston of all these small irregular forces must be equal to that of the force of gravity if there is to be equilibrium.
假使两方面保持平衡，那么所有这些小的不规则的力对活塞的有效作用必须与重力相等。
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