Introductory remarks: Mainly give an account of the summary of study present situation, the theory bases and the main research methods of this paper.

导论主要讲述了研究现状综述、本文的理论依据与主要研究方法。

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Chemistry 11 is an introductory laboratory course concerned with the description, classification and theory of matter.

高二化学是一门化学基础介绍性的实验课程，涉及到部分化学现象的描述、分类、理论实践等方面内容。

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In the paper, first of all, in the introductory part of the proposition of the times, the practice of confusion, three areas inspired the theory of research problems;

论文中，首先，在引言部分根据时代的命题、实践的困惑、理论的启迪三方面提出研究的问题；

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In the paper, first of all, in the introductory part of the proposition of the times, the practice of confusion, three areas inspired the theory of research problems;

论文中，首先，在引言部分根据时代的命题、实践的困惑、理论的启迪三方面提出研究的问题；

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