But over time the insects develop resistance to the chemicals.
但随着时间的推移，蚊虫会对化学品产生耐药性。
Due to the wide use of insecticides, resistance of many insects increased quickly.
随着杀虫剂的研发和广泛使用，越来越多的昆虫对杀虫剂产生了抗药性。
Due to the wide use of insecticides, resistance of many insects increased quickly.
随着杀虫剂的研发和广泛使用，越来越多的昆虫对杀虫剂产生了抗药性。
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