请分析一个英语句子Studies of both animals and humans have shown that

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请分析一个英语句子
Studies of both animals and humans have shown that sex hormones somehow affect the stress response,causing females under stress to produce more of the trigger chemicals than do males under the same conditions.
汉语意思是：对动物和人类所作的研究表面,性荷尔蒙会以某种方式影响对压力的反应,导致女性在压力下产生的诱发化学元素比同样条件下的男性产生的多.
请问than 后面为什么是"do males”而不直接是"males",因为该句是女性和男性的一个比较啊?

do males,不是倒装,而是 “causing” 的代动词,即：causing males under the same conditions.这里是对 females 与 males 之间引发.方面的比较,比较诱发动词.

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