metal sleeve

例句：

1. 1. The tool was wrapped in a metal sleeve to protect it from damage.
   这个工具被包裹在金属套筒中以保护它不受损坏。
2. 2.The car had a metal sleeve on the engine to prevent rust.
   汽车发动机上有一个金属套筒以防止生锈。
3. 3. The engineer used a metal sleeve to cover the drill bit to make it easier to remove.
   工程师用一个金属套筒覆盖钻头，使其更容易取出。