The study followed the lives of these teenager boys.

这项研究跟踪调查了这些十几岁男孩们的生活。

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Now she's a teenager, she's starting to be interested in boys.

她现在已经是个十几岁的姑娘了，开始对男孩子感兴趣。

《牛津词典》

They are a teenager band made up of four cool boys.

他们是一支由四名酷哥组成的少年演唱队。

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The field then suffered a major setback when an Arizona teenager died in a gene therapy experiment in 1999 and two French boys with SCID developed leukemia in 2002.

MSN: European regulators back first gene therapy drug