In some age cohorts, there are 20 million more males than females.

因为重男轻女现象的存在，很多女婴没有出生就被流产了。

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A series of ecologic analyses of pertussis notifications during epidemic periods in relevant age cohorts were conducted.

文章对相关年龄组流行阶段的百日咳呈报案例进行了系列生态学分析。

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There was an even distribution of fractures across the age cohorts, and most fractures were sustained from a high-energy transfer mechanism.

这里有同龄病人骨折的评价分布情况，最常见的致伤原因是高能量传递机制。

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This is achieved by looking at tests of different age cohorts.

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An explanation for this divergence might lie in the fact that while younger borrowers are more commonly underwater, they are underwater by less than those in older age cohorts.

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Which brings us to this point about age cohorts.

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