然而，棉铃虫并不一定会对棉花的杀虫剂产生抗药性。
Bollworms, however, are not necessarily developing resistance to the cotton's insecticide.
癌细胞和细菌一样对药物会产生抗药性。
Tumor cells, like bacteria, can develop resistance to drugs.
没有被抗生素完全杀死的细菌会突变并产生抗药性。
Bacteria that are not killed entirely by an antibiotic will mutate and become resistant to it.
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