求翻译：原则上，假设出于教学目的，教学的接受者们各自购入市面上贩卖的教科书、习题集、参考书等，进行复制使用的行为是不允许的是什么意思？

In principle, it is assumed that the recipients are for the purpose of teaching, teaching each purchase of market trafficking textbooks, problem sets, reference books, copy behavior is not allowed

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In principle, the supposition stemming from the teaching goal, the teaching receivers respectively buys the textbook, the exercise collection, the reference book which in the market condition trades and so on, carries on the duplication use the behavior not to permit

In principle, assume that for teaching purposes, recipients were teaching their buying on the market sale of textbooks, exercise book, reference book, used by replication is not allowed

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