以下为句子列表：
英文: This means that the air vessels are always charged to an optimum degree and that pulsations are reduced to a negligible level (even with single-acting pumping systems), which plays an important role in preventing the delivery valves and the gearbox from s
中文: 这表明空气槽总是被充气至最佳程度，而脉冲被减少到可以忽略的地步（单作用泵系统亦然）,这对于保护进出口阀和齿轮箱免受冲击,延长它们的使用寿命起着重要的作用。
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