他乞求老师在讲课时语速再快上一倍，那就能提前一半的时间下课。
He begs his teacher to talk twice as quickly so that class will be over in half the time.
第二天，当老师背靠着火炉讲课时，发现好几个学生的嘴唇在很快地不停地动。
The next day he was speaking, standing with his back to the fire, when he noticed several lips moving rapidly.
当老师或教授在讲课时，我们通常在课堂上谈论记笔记的事情，但在这种情况下，当我在读其他文件时，我正在做笔记。
We usually talk about taking notes in class when a teacher or a professor is speaking, but in this case, I'm taking notes as I read other documents.
当老师在讲课时同学们自言自语是不礼貌的。
It's not polite to talk with students when the teacher is teaching.
有的时候，在听老师讲课时，我会忍不住想象，假如我是一名老师，我会怎样做。
Sometimes, when I am listening to the teacher, I can't help thinking that if I were teacher, what I would do.
有的时候，在听老师讲课时，我会忍不住想象，假如我是一名老师，我会怎样做。
Sometimes, when I am listening to the teacher, I can't help thinking that if I were a teacher, what I would do.
我们的老师在讲课时给我们提出了疑问！
我们的老师在讲课时给我们提出了疑问！
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