The key of selection of teaching material was to evaluate the quality of teaching material, many factors were related to the quality of teaching materials, and each factor was fuzzy.

教材质量的评判是选择教材的关键，涉及教材质量的因素较多，且各因素具有模糊性。

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Especially when teaching success seems to depend so mightily on the quality and drive of the student material one is given?

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