我在上课学防身术。
你在上课前有预习的吗？
我一直都在上课！
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.
就在上课前，玛丽摔碎了她的眼镜。
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。
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?
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.
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.
一张照片显示，在一个农村的教室里，一些学生正在上课，在教室的泥地面上还有一些泥水坑。
One photo showed that students at their desks in a rural classroom, surrounded by muddy puddles on a dirt floor.
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。
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.
他在上课前给我们讲了个非常幽默的故事。
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.
不要把你所有的时间花在上课上。
你们手头上东西，都是我们在上课前买到的。
So, these things here that you have in your hand, is the results of my spontaneously going to staples before class.
18%的高中生则会在上课的时候使用手机。
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.
在上课之前，小朋友们，我们猜个谜语，好不好？
或许那四只在看着Con的海豚是在上课。
我邀请你在上课的时候提问，如果你愿意的话，课后也行。
I invite you to ask questions in class or, if you prefer, after class as well.
那么第二节课时，在上课前所输入的将不仅是第一节课的知识。
Before the second lesson begins, one has not only the knowledge of the first lesson.
那么第二节课时，在上课前所输入的将不仅是第一节课的知识。
Before the second lesson begins, one has not only the knowledge of the first lesson.
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