在任何国家，很大比例的罪行都是十几岁和二十几岁的青年男子所为。
A high proportion of crime in any country is perpetrated by young males in their teens and twenties.
20世纪初期，美国和其他富裕国家最早出现有组织的青年体育运动。
Organized youth sports first appeared during the early 20th century in the United States and other wealthy nations.
在青年科学夏令营中，我们和其他国家的学生合作制作机器人，不仅获得了知识，还收获了友谊。
We worked in cooperation with students from other countries in making robots in the youth science summer camp, gaining not only knowledge but also friendship.
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