老师正在讲课，爱丽丝打起瞌睡来了。
老师正在讲课，彼得打起瞌睡来了。
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.
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.
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.
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