1·Since then, a second threat has appeared, on leaflets left on cars and addressed to the families of the youths.
在那之后，第二份威胁开始出现在夹在汽车上的传单上，这些青少年的家里也收到了寄来的邮件。
2·Mixed symptoms also are common in youths with bipolar disorder.
双相混合症状在青少年中也很常见。
3·I can just see the cover images, with hooded youths and blocky red sub-titles.
我都可以预见书皮的画面是怎样的了——一群戴着兜帽的青少年，配以字字加粗、颜色血红的副标题。
4·The percentage of high school aged youths, who ate foods and vegetables 5 or more times per day, decreased from 21 percent to 19 percent in the same period.
与此同时，每天吃食物和蔬菜5次以上的高中青少年比例从21%下降到19%。
5·The survey included more than 1, 000 youths from around the nation aged 12 to 17 and about half of their parents.
这项研究在全国范围内调查了1000多名12岁到17岁之间的青少年和一半他们的父母。