teaching English by different levels

• 分层教学

teaching English by different levels的用法和样例：

例句

1. Teaching with layers headstream is in China.
   分层教学的源头在中国。
2. This paper introduced the procedures for building up a kind of NCS laboratory oriented to hierarchal teaching and research.
   介绍了关于面向分层教学与科研的网络控制实验室的创建过程。