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. In several of the studies, when stressed-out female rats had their ovaries (the female reproductive organs) removed, their chemical responses became equal to those of the males.
这段话依然是两句，必然还有一个主题句，这一段的主题句。第一句说的是studies showXXX，而第二句说的是In several of the studies。那么就表明第一句是结果，第二句是例子了，第二句的研究得出了第一句的结果。这样能理解吗？
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.
自然而然，shown后面就是主题吧？
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.这个就是主题
Adding to a woman’s increased dose of stress chemicals, are her increased “opportunities” for stress. “It’s not necessarily that women don’t cope as well. It’s just that they have so much more to cope with,” says Dr. Yehuda. “Their capacity for tolerating stress may even be greater than men’s,” she observes, “it’s just that they’re dealing with so many more things that they become worn out from it more visibly and sooner.”
这一段是三句，依然可以分为两部分，后面一部分还是一个权威人士的说话内容，这个可以先不去管他，但是你要知道这句话是哪个人说的，以免后面的问题问你这个人说过的话，而你想不起来再哪里出现过，又重头看一遍文章。
Dr. Yehuda notes another difference between the sexes. “I think that the kinds of things that women are exposed to tend to be in more of a chronic or repeated nature. Men go to war and are exposed to combat stress. Men are exposed to more acts of random physical violence. The kinds of interpersonal violence that women are exposed to tend to be in domestic situations, by, unfortunately, parents or other family members, and they tend not to be one-shot deals. The wear-and-tear that comes from these longer relationships can be quite devastating.”
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