weed killer

例句：

1. 1. The farmer sprays the field with herbicides to kill the weeds.
   农民用除草剂喷洒田地以杀死杂草。
2. 2. The weed-killer is effective in killing the weeds in the garden.
   这种除草剂在花园里对杂草非常有效。
3. 3.The farmer used a herbicide to control the weeds in his crops.
   农民使用除草剂来控制他作物中的杂草。