hours of use

基本解释

I had to reboot it all the time. We’re talking once every two or three hours of use!
我不得不不断重启，也就是每两到三个小时重启一次！
zhangfugao84.blog.163.com
In aggregate, that means the document Web was down more than half a billion hours of use (that’s more than 800 lifetimes) this March versus last March.
总体来说，这以为这文本性网络在上一年的三月到今年的三月期间用户使用时间下降了超过5亿个小时（这超过了800个人的生命时间）。
Must make students who are time-slicing assignments from four or five courses more productive within one month of adoption (i.e., after five to ten hours of use spread over two weeks).
使用该软件，学生在一个月内通过完成四到五次作业（比如在两周内花费总共五到十个小时来使用该软件），能够变得更有效率。

But traditional guidelines say not to use tPA if more than three hours have passed after the first signs of a stroke.
And they have graciously meet available their complete Film library. Not just the documentaries but the films They use before cut together the documentary for every hour of documentary their might be a hundred more hours of source video and film.
他们还实现了完整的电影图书馆,不仅是成型的纪录片,还有最初未剪辑的完整电影,每一个小时的纪录片背后他们可能,有超过100个小时的资料片电影。
麻省理工公开课 - 媒体、教育、市场课程节选
Course assistants as we use the jargon are alumni of CS50 who return to the course for a couple of hours a week having taken it in prior years, to help you, the newest batch of students, one on one with office hours, with problem sets; and similarly do the CS function as they might in many courses.
课程助理用我们的行话说就是CS50校友0,他们在前几年一直都是一周回来几个小时,来帮助你们这些新生，在上机的时候以一对一的方式，帮助你们完成这些问题集,在很多其他课程中他们也是这么做的。
哈佛公开课 - 计算机科学课程节选

The LED bulb is rated for 40, 000 hours of use and can last over 15 years.
ENGADGET: Klipsch LightSpeaker makes whole home audio as simple as screwing in a light bulb (hands-on)