上课时注意听讲意味着以后少花力气。
Listening to what the teacher says in class means less work later.
上课时要注意听讲，把学习全面提高，改掉心不在焉的坏毛病。
Attention should be paid to listen in class, improve our studies, the bad habit of break in the clouds.
休息不好甚至使我们在上课时无法集中注意力听讲。
We can't even pay attention to what the teacher says in the class.
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