老师正在讲课，爱丽丝打起瞌睡来了。
当我正在讲课的时候，他打断了我。
老师正在讲课，彼得打起瞌睡来了。
成教授正在讲课。
成教授正在讲课。
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.
当我正在办公室冥思苦想地准备当晚要在城镇那头的一间学院讲课用的讲义时，电话铃响了。
I was deep in thought at my office preparing a lecture to be given that evening at a college across town, when the phone rang.
10月12日，一名乡村学校的阿富汗女孩正在课堂上聚精会神地听老师讲课。
An Afghan girl listens to the teacher during class at the Naswani school October 12 2010 in Eraq village Afghanistan.
北京大学著名导师陈明亮正在给150余名经销商讲课。
The famous teacher in Peking University, Chen Mingliang gave a lecture to more than 150 dealers.
北京大学著名导师陈明亮正在给150余名经销商讲课。
The famous teacher in Peking University, Chen Mingliang gave a lecture to more than 150 dealers.
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