filler metal

例句：

1. 1. The engine requires a specific type of filler metal to operate properly.
   发动机需要特定的填充金属才能正常运转。
2. 2.The car's engine was replaced with a new filler metal to improve performance.
   为了提高性能，这辆车的引擎被替换了新的填充金属。
3. 3.The engineer used a special filler metal to repair the damaged part of the machine.
   工程师使用一种特殊的填充金属来修复机器的损坏部分。