Sleep efficiency (the time spent asleep compared to time in bed), falls from its high values in youth (95%-98%) to 70%-80% in older age.

睡眠质量(睡眠时间与在床上的时间比)从年轻人的95% - 98%下降到老年人的70% - 80%。

youdao

Ostrofsge's how the steel being refined and Yangmo's the song of youth both had received an extremely similar comment in spite of their publishing time being far away from each other.

奥斯特洛夫斯基的长篇小说《钢铁是怎样炼成的》和杨沫的《青春之歌》两部小说，虽然出版时间相距较远，但二者所受评价惊人相似。

youdao

Since when do not know from time to increase the speed, moving further and further time to become fast, faster even youth can not pull the tail all.

也不知道从什么时候起时间加了速，日子变得愈走愈快，快的连青春的尾巴都拽不住了。

youdao

The writer says she saw these Indians as time-travelers moving away from tradition and an eventless youth, heading into an exciting and high-tech future.

VOA: special.2011.07.13

The minister also denied youth unemployment was at its highest level "if you exclude from the figures full-time students who are looking for a part-time job".

BBC: Government defends record on youth unemployment

However, if a leader chose to make it a focus of his or her time with youth they could be removed from the program.

CNN: Boy Scouts feel a mother's wrath

Muslim youth who spend time on the Internet are exposed to sophisticated videos from terrorist groups showing Muslims being killed in places such as the West Bank, Iraq and Chechnya, Jones says.

CNN: Experts: Many young Muslim terrorists spurred by humiliation