许多孩子在大班上课时学习效果不好。
老师警告说，如果他们上课时继续使用手机就予以没收。
The teacher threatened to confiscate their phones if they kept using them in class.
因为到了上课时间，她急忙跑到教室。
迈克在上汉语课时睡着了。
现在是下课时间，所以他们不在教室里。
在上课时用玩笑话打断老师是不礼貌的。
It is impolite to interrupt teachers with jokes during class.
有些人可能会想：“60个课时太多了。”
上课时坐好，保持安静。
上课时一定要保持安静。
上课时，我们不应同时发言，而应轮流发言。
In class we should not talk at the same time; we should take turns.
在上课时不要向外看。
他们应该在毕业前做60个课时的志愿者工作。
They are supposed to do sixty class hours of volunteer work before graduation.
到上课时间了。
上课时，他总是一言不发，安静地像个害羞的小姑娘。
During class, he would never say a word and was quiet like a shy girl.
主日学校的上课时间是9点到10点半；然后是教堂礼拜。
Sabbath-school hours were from nine to half-past ten; and then church service.
当学生们去上课时，他们经常不确定他们是有机器人还是真的老师。
Often, students are not sure whether they have the android or the real teacher when they go to class.
在Low教授给NBA学生上课时，我们录下整个上课过程，然后刻成光盘。
We video clipped the class as Professor Low taught the NBA students and then converted them to CDs.
在大学上课时，作者意识到许多关于亚裔美国人的知识都是他在课本上从未学到过的。
When taking a class in college, the author realized that a lot of information about Asian Americans was left out of the textbooks he studied.
如果你在黑板上写字，下课时要擦掉。
If you write on the blackboard, rub it off at the end of the lesson.
学生上法语和数学课时按能力分成小组。
上课时她一直不专心。
该做功课时，你老是跑出去溜滑板！
You're always out skateboarding when you should be doing homework!
上体育课时我总是遭到一些同学嘲笑。
I was often laughed at by some of my classmates in my P.E. class.
这样，你就可以避免在去上课时耽误时间。
That way, you will avoid potential time delays in getting to your classes.
后来到了第三节课时，杜老师进来叫我到前面去。
Later in the third class, Mr. Du came in and asked me to go to the front.
中国教育部宣布，学校应该禁止学生在上课时间携带手机。
The Education Department of China has announced that schools should ban students from carrying mobile phones during school hours.
在英国的上学日，除去上课时间，孩子们最多可以每天工作两小时。
Children in Britain can work two hours a day at the most on a school day but not during school hours.
一位专家表示，在上课时间使用手机会分散学生的注意力。
An expert said mobile phone use was a distraction to students during school hours.
当我坐在长凳上等待上课时，我看到蒂莫西向詹娜挥舞着一个棕色的纸袋。
As I was sitting on the bench, waiting for class to begin, I saw Timothy waving a brown paper bag at Jenna.
第一次在化学实验室上课时，我惊讶地发现学生们都“全副武装”了起来。
The first time I took a class in the chemistry lab, I was surprised to find that students were fully "armed".
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