To prevent industrial alcohol from being consumed, the government required manufacturers to add harmful chemicals, leading to thousands of poisoning deaths.

为了防止工业酒精被消耗，政府要求制造商添加有害化学物质， 导致数千人中毒死亡。

But Carson showed how the overuse of chemicals led to the evolution of resistant species — which, in turn, encouraged the development of deadlier chemicals.

卡森揭示了化学物质的过量使用将导致物种产生抗药性——从而反过来促使企业研发更具杀伤力的杀虫剂。