单词：chemical insecticide
chemical insecticide的用法和样例：
例句
- It is not my contention that chemical insecticides must never be used.我不是说人类决不能使用化学杀虫剂。
- Certain chemical pesticides used to control in- sects have also been well studied.对一些特定的用来控制昆虫的化学杀虫剂也研究得比较多。
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英语听力广播—Listening