metal fixing

例句：

1. 1.The engineer used a metal fixing to secure the bolts.
   工程师使用一个金属固定件来固定螺栓。
2. 2. The car was fixed with metal fixings before it left the factory.
   汽车出厂前用金属固定件进行了修复。
3. 3. The metal fixings on the door were rusted and needed to be replaced.
   门上的金属固定件生锈了，需要更换。