分层教学在这种情况下应运而生，成为优化单一班级授课制的有利途径。

Teaching in these circumstances came into being and become optimize a single class of medium-beneficial way.

youdao

分层教学在这种情况下应运而生，成为优化单一班级授课制的有利途径。

Teaching in these circumstances came into being and become optimize a single class of medium-beneficial way.

youdao