求翻译：It can be argued for example,that teaching can be accomplished more effectively if teacher and student take their appropriate roles是什么意思？

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It can be argued for example,that teaching can be accomplished more effectively if teacher and student take their appropriate roles

问题补充：

匿名	2013-05-23 12:26:38 可以说，例如，教学可以更有效地完成，如果老师和学生采取相应的角色

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