These various times are mentioned because an engine that requires cylinder refinishing is usually in need of a general overhaul and these other services will also be required.
这里之所以提供几种不同的时间，是因为需要整修气缸的发动机通常必须进行大修，那么这些维修工作也就必不可少。
There is a reasonable economic limit between general overhaul and renewal of mechanical equipment.
机械设备的大修理与更新之间存在合理的经济界限。
There is a reasonable economic limit between general overhaul and renewal of mechanical equipment.
机械设备的大修理与更新之间存在合理的经济界限。
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