shearer gearhead

例句：

1. 1. The shearer was used to cut the grass.
   割草机被用来割草。
2. 2. The gearhead was responsible for the maintenance of the machinery.
   这个齿轮头负责机械的维护工作。
3. 3. The shearer and gearhead were both essential tools in the operation of the farm.
   割草机和齿轮头都是农场操作中必不可少的工具。