它的工作原理相同的方式，作为开关打开或关闭的发动机声音。

It works the same way as switching engine sound on or off.

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每当蓄压器的电足够开动发动机时，这个内燃发动机就会关闭。

The internal combustion engine shuts down whenever the accumulator charge is sufficient to drive the motor.

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在需要的功率激增时，拖船可以从电池获得额外的电力；当它闲置时，可将其柴油发动机关闭，用电池为其它设备供电。

The tugboat could draw extra power from the battery when full-power surges were needed, and turn its diesel engines off altogether when it was idle, allowing the battery to power other equipment.

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