For some, he is the substitute teacher of their dreams.
对一些人来说，他是梦寐以求的代课老师。
When the teacher was sick, there was no substitute teacher.
如果老师生病了，也没有代课老师。
She is a substitute teacher in a kindergarten now. It is a very exacting job.
她现在是个幼稚园的代课老师，这是个辛苦的工作。
When one teacher is sick, another teacher may substitute for him.
当一个老师生病的时候，另一个老师就可能代替他。
When one teacher is sick, another teacher may substitute for him.
当一个老师生病的时候，另一个老师就可能代替他。
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