herbicidal chemicals

例句：

1. 1.The farmer used a herbicidal spray to kill the weeds in his field.
   农民使用一种除草剂来杀死他的田地里的杂草。
2. 2. The herbicidal agent is effective against many types of weeds.
   这种除草剂对许多类型的杂草都有效。
3. 3. The farmers need to use herbicidal chemicals to control the growth of weeds in their crops.
   农民需要使用除草剂来控制他们作物中杂草的生长。