请分析一下Studies of both animals and humans have shown that .,

来源：学生作业帮编辑：拍题作业网作业帮分类：综合作业时间：2024/05/13 03:59:01

请分析一下Studies of both animals and humans have shown that .,
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?

注意区别：
比较的不是“男性和女性” ,而是比较“导致女性在压力下产生的诱发化学元素”和“导致男性在压力下产生的诱发化学元素”,哪个多
所以你必须把动词带出来,否则就是比较导致女性在压力下产生的诱发化学元素“和”男人“的数量了.

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