gear wheel

例句：

1. 1.The car has a new gear wheel installed.
   这辆车安装了新的齿轮箱。
2. 2. The mechanic replaced the worn gear wheel with a new one.
   机械师用一个新的替换了磨损的齿轮箱。
3. 3.The engineer designed a special gear wheel for the heavy machinery.
   工程师为重型机械设计了一个特殊的齿轮箱。