在过去，研究昆虫对植物防御的适应性方面始终关注的是化学反馈，也就是说昆虫如何中和或者改变植物产生的有毒物质。
In the past, scientists who studied insect adaptation to plant defenses have focused on chemical responses. That is, how the insects can neutralize or alter the poisonous substances plants produce.
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