coefficient of wear and tear

例句：

1. 1. The car's engine isshowing signs of wear and tear.
   这辆汽车的引擎显示出磨损的迹象。
2. 2. The oldhouse has seen its fair share of wearand tear over the years.
   这座老房子多年来经历了相当多的磨损和损耗。
3. 3. Astime passed, the old car began toshow more wear and tear than it usedto.
   随着时间的流逝，这辆旧车开始比过去更多地显示出磨损和损耗。