The only condition for this law is no unbalanced force should act upon it.

这条定律的唯一条件是没有不平力的影响。

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But the shaft by the unbalanced force, serious wear and tear, leak bigger.

但泵轴受不平衡力，磨损严肃，走漏较大。

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But the shaft by the unbalanced force, serious wear and tear, leak bigger.

但泵轴受不平衡力，磨损严肃，走漏较大。

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