insecticide

例句：

1. 1.The pesticide was effective in controlling the population of insects.
   这种杀虫剂在控制昆虫数量方面非常有效。
2. 2.They sprayed the area with a mixture of insecticide and water to kill the bugs.
   他们用一种含有杀虫剂的水混合物喷洒了那个区域，以杀死虫子。
3. 3.The farmers used natural insecticides to control the beetles that were damaging their crops.
   农民们使用天然的杀虫剂来控制那些损害他们庄稼的甲虫。