Secondly, when we leave our house or classroom, we would better turn of the lights, fans or airconditioning.

其次，当我们离开我们的房子或教室时，我们最好把灯，风扇或空调关了。

Secondly, on teacher-student interaction in the classroom teaching the existing problems.

其次，阐述课堂教学中师生互动存在的问题。

Firstly, this paper analyzes the related concept to the evaluation of classroom teaching. Secondly, the paper introduces the systemic engineering of classroom teaching evaluation and its design.

为进行软件系统的设计与实现，本文首先对课堂教学评价的相关概念进行了剖析，继而介绍了课堂教学评价系统工程及其设计。