备件

例句：

1. 1. The carneeds some new tires to be replaced.
   这辆车需要一些新的轮胎来替换。
2. 2. Hekept a spare key in his pocket foremergencies.
   他在口袋里保留了一个备用钥匙以备不时之需。
3. 3. The mechanicchecked the engine and found several spare partsneeded replacement.
   机械师检查了引擎，发现有几个备用零件需要更换。