If resident doctors work shorter hours, the researchers said, errors could happen when one resident takes control of a patient's care from another.

VOA: special.2010.07.13

and a unit is generally 3 to 5 hours of work a week.

而且每门课通常是一周3到5个小时。

很好奇住宿生活 - SpeakingMax英语口语达人

And nine hours a week of outside-the-class work.

每周还有九个小时的课堂外工作。

麻省理工公开课 - 计算机科学及编程导论课程节选

A team led by Alex Blum of Mount Sinai School of Medicine in New York found that the public wants to limit work hours by resident doctors.

VOA: special.2010.07.13

So in sections where you have the opportunity to work in smaller environments with one of the teaching fellows, in office hours we have an opportunity to work one on one, hands-on in the computer lab or else we're on campus and really get personalized attention when it comes to diving into these problems.

因此在分组后,你们有机会与教员们一起在小房间里工作，在上机时间内我们有机会一对一授课，在实验室内亲身实践,不然的话我们在校园里探讨问题,会被很多人围观的。

哈佛公开课 - 计算机科学课程节选

They completed over one hundred sixty-three thousand hours of volunteer work.

VOA: special.2010.05.28

Instead of continuing to work into the wee hours of the morning,

因此，你决定不再继续加班到凌晨，

Let's 课堂 - SpeakingMax英语口语达人

Long hours of overtime work may go unpaid or underpaid.

VOA: special.2009.06.08