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。
A series of ecologic analyses of pertussis notifications during epidemic periods in relevant age cohorts were conducted.
另一个令人惊讶的发现是，肠道内的生态系统并不取决于年龄，所在和遗传组成。
The other surprise was that the ecosystem you have doesn't seem to depend on how old you are, where you live in the world or your genetic make-up either.
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