In some classes, many students were even falling asleep.
在上某些课时，有很多同学甚至都睡着了。
Some teachers find it difficult to keep their classes in order.
有些教师觉得难以维持课堂秩序。
In some cases, the business object model evolved into system classes.
在某些情况下，业务对象模型将演化成系统类。
Some of them skip classes just because they have no interest in certain subjects.
他们中的一些人逃课，只是因为他们对某些科目没有兴趣。
Some of them skip classes just because they have no interest in certain subjects.
他们中的一些人逃课，只是由于他们对某些科目没有乐趣。
I always want to go out of classes, and take part in some substaintial thing.
一直以来，我都想走出课堂，多去参与一些更实在的事。
Some boy students were_caught_smoking in the toilet between classes.
几个男生课间在卫生间吸烟被当场抓住。
Some of them skip classes just because they have no interest in certain subjects.
有的跳班仅仅是因为他们没有在某些科目的兴趣。
Some fall behind others of their classes in school work and others often cut classes.
有些人学习成绩下降，有些人则经常逃学。
Some teachers find it difficult to keep order in their classes.
有些老师觉得课堂秩序很难维持。
Some teachers find it difficult to keep order in their classes.
有些老师觉得课堂秩序很难维持。
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