一个混合的学生群体可以改变课堂的活力，有利于学生学习。
A mixed student body may change the classroom dynamics and benefit learning.
它不仅有利于学生自身，而且对社会也是有好处的。
It is not only benefiting for students themselves, but also for the society.
创设的数学情境要有利于学生对问题提出方法的学习和迁移练习。
The created mathematical situation should help students to learn the methods and practise migration.
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