You've got to attend class and pay attention while in class.

你得去上课，而且得上课时得留心听讲。

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Today, while in class, I gathered my stuff and got up. A minute later I hear a girl say, "Oh, Jessica left?"

今天在教室里我一边收拾东西一边站起来，过了一会我听到一个女孩说：“杰西卡要走了？”

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The next day, at their school, the woman asks the man to keep an eye on, or watch the young students in her class while she is out of the classroom.

VOA: special.2009.09.06

I will use that to post information, maybe once in a while send an e-mail to the whole class.

我会在那上面发布通知,可能隔一段时间就会给全班群发一封邮件

耶鲁公开课 - 基础物理课程节选

And while I'm at school in class, I can use the e-books of the courses that I'm studying.

在学校上课的时候，我也可以使用那些我修的课程的电子材料。

What kind of实战 - SpeakingMax英语口语达人

While in class, I complained to another dad about the painful decision of saving my back or my knees while assisting children with their cutting and gluing.

CNN: Junior Seau was hurting and didn't know how to say it

James Rawson, Neil Robinson and Stefan Trofan, who won silver in the class three in Sydney, lost 3-0 to Germany, while Arnie Chan and Scott Robertson, in the class 5, were beaten 3-0 by Korea.

BBC: SPORT | Other Sport | Paralympics | Track gold lifts Britain

This obviously requires husbands to be prepared to manage the household chores while their wives are in class.

UNESCO: OFFICE IN KATHMANDU