我的小汤姆在几个小时前没打招呼就走了，到处找不到。

My little Tom departed me several hours ago without notice and he is nowhere to be found.

youdao

每天早上，默里5点钟起床，在早餐前工作几个小时。

Every morning, Murray got out of bed at five o'clock and worked several hours before breakfast.

youdao

因为火车预期在启航前几个小时到达佛罗里达州的迈阿密，所以我们觉得没有理由担心是否能准时到达码头。

Because the train was scheduled to arrive in Miami, Florida, several hours before the sailing, we didn't think we'd have any reason to worry about getting to the dock on time.

youdao

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