求翻译：1.磨：即磨合。这是延长使用寿命的基础，无论是新车还是大修后的发动机，都必须按规程进行磨合后，方能投入正常作业。是什么意思？

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1: The grinding mill . . This is the life extension Foundation, whether it is a new car or after overhaul, the engine must be based on a point, experiment to normal operations.

1. rubs: Namely wearing in.This is lengthens the service life the foundation, after regardless of is the new vehicle or the overhaul engine, all must carry on wearing in after the regulations, the side can invest the normal work.

1. grinding: grinding. This is the basis for extended service life, whether it is a new car or an overhauled engine, must be a point after the break-in, before it can be put into normal operation.