Chemical herbicides

• 除草剂

Chemical herbicides的用法和样例：

例句

1. Most herbicides were degraded and run off in soil.
   大部分除草剂在土壤环境中被降解或流失。
2. Resistance of weeds to certain herbicides is beginning to show up.
   杂草对某些除草剂的抗药性已显现出来。