但是，全世界各国青少年的身体活动水平正在下降，尤其是在贫穷的城市地区。据估计，不足三分之一的青少年有足够的活动以促进其当前和未来的健康与福祉。

However, physical activity levels are decreasing among young people in countries around the world, especially in poor urban areas.

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为了帮助青少年拥有强壮的身体，九年级的学生每年都要参加中考体育考试。

In order to help teenagers build a strong body, students in Grade 9 have to take part in zhongkao P.E. test every year.

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青少年每天需要8-10个小时的睡眠，因为他们需要大量能量来长成成年人的身体。

Teenagers need 8-10 hours of sleep a day because they need lots of energy to grow into their adult bodies.

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