我在上课学防身术。
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.
你在上课前有预习的吗？
我一直都在上课！
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.
我知道这听起来人尽皆知，但是我看到过一些人就在上课的时候才突然发现相机坏了。
I know it sounds obvious but I've seen a few people suddenly find the camera's stopped working right in the middle of class.
在上课时不要向外看。
就在上课前，玛丽摔碎了她的眼镜。
当你正在上课的时候，你有没有在笔记本的空白处画过画？
When you're sitting in class, have you ever drawn pictures in the margins of your notebooks?
值班生应该在上课前分发练习本。
The student on duty should hand out the exercise books before class.
我的生物老师怀特先生在上课前五分钟来到了教室。
My biology teacher, Mr. White, came to the classroom five minutes before the class began.
他正在上课。
我忘了我在上课，直到布朗老师来到我的课桌前我才发现。
I forgot that I was in class until Ms. Brown came by my desk.
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.
这会防止你在上课的头几天里迷路，并使你熟悉从一个地方到另一个地方需要多长时间。
This will prevent you from getting lost in the first few days of classes, and familiarize you with how long it takes to get from place to place.
那些因为某些需要得带手机的学生必须取得父母和老师的同意，并且必须在上课期间上交手机。
Those who require their phones for some need must get their parents' and teachers' approval and must hand their phones over during class time.
我必须在上课前匆匆写出一篇学期论文。
从前她常在上课时画每个人的滑稽相。
She used to draw funny pictures of everybody during lessons.
他总是在上课的时候睡觉。
最好是在上课前就已经阅读过指定材料。
Ideally, keep up with the readings before you come to class.
不要把你所有的时间花在上课上。
他在上课前给我们讲了个非常幽默的故事。
各个团队在上课伊始就开始提出问题。
The teams get to ask questions at the beginning of the class.
请早几分钟到，你在上课前要填几份表格。
Be here a few minutes early. You need to complete some forms before the class.
如果你不得不在上课时离开，那就悄悄地走。
18%的高中生则会在上课的时候使用手机。
——真的很抱歉。我在上课时，车被人偷走了。
I'm really very sorry but it was stolen while I was at school.
——真的很抱歉。我在上课时，车被人偷走了。
I'm really very sorry but it was stolen while I was at school.
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