求翻译：　　一、听音法：柴油机在怠速运转中可用“听疹器”（不是医生给病人看病用的，而是一把大螺丝刀）触及喷油嘴上，听其声音变化的差异。如有较大的敲击声，说明供油量过大或喷油时间过早；若无敲击声，而只有“嗬嗬”连续不干脆的响声时，说明供油量过小或喷油时间过晚。是什么意思？

Listening France: diesel engine available in the idle running "Listen rash" (not a doctor with a patient, but a large screwdriver) touches the nozzle on, listening to the difference of the sound changes. If a larger percussion, indicating that the oil supply excessive or premature fuel injection tim

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　　First,