thistle extirpator

例句：

1. 1. The farmer used a weeder to remove the thistles from his field.
   农民使用除草机从他的田地中除去了这种草。
2. 2.The old man spent hours hoeing the garden to get rid of the thistles.
   老人花了很多小时在花园里挖土，以除掉这些野蓟。
3. 3. The weeder is an essential tool for farmers in their efforts to control weeds in their fields.
   除草机是农民控制田间杂草的重要工具。