引言部分，介绍了研究的对象、写作的背景及选题的意义。

In the introduction, the author explains the subject, background and significance of the research.

youdao

引言部分，介绍了研究的对象、写作的背景及选题的意义。

In the introduction, the author explains the subject, background and significance of the research.

youdao