Half of the emerging HIV infections occurred in the 15-24 age group.
在新发生的HIV感染中,大约一半发生在15-24年龄组。
参考来源 - 河南省某校在校大学生艾滋病知识、态度、行为研究·2,447,543篇论文数据，部分数据来源于NoteExpress
同义词： age group age bracket cohort
以上来源于: WordNet
N-COUNT An age group is the people in a place or organization who were born during a particular period of time, for example, all the people aged between 18 and 25. 年龄群
...a style that would appeal to all age groups.
...将会吸引各年龄群的风格。
"What does your market research consist of?"—"Well, the thing is, it depends on our target age group."
“你的市场研究包含什么内容？”—“哦，问题是，这取决于我们的目标年龄群体。”
Since you're reaching the majority of the teachers in your target age group, you're probably spending your money well, which brings us to the third M—Money.
由于你正接近你目标年龄群中的大多数老师，你很可能把钱花得很值，这就引出了第三个 M——钱。
She is among the most promising players in her age group.
在她那个年龄组中她是最有前途的选手之一。
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