These others were chosen to match the study group's age profile, sex ratio and dwelling place.

其他这些人被选择过来以匹配研究对照组的年龄构成，性别比例以及居住地址。

It has only taken China 20 years to reach an age profile that took Britain or France 60 or 70 years.

中国花费20年形成了这种年龄结构，而英国或法国却需要60或70年。

And I’m sure it won’t surprise you to hear that morbidity rates within a society can vary a lot across demographic groups for a number of reasons, like the racial makeup of a society or the age profile of those people.

我敢肯定，由于多种原因， 一个社会的发病率在不同人口群体中可能存在很大差异，例如社会的种族构成或这些人的年龄概况， 您不会感到惊讶。