Our Destiny in Space "is an expository writing about popular science."

“我们在太空中的使命”为一篇有关科普知识的说明文。

Much of the previous research has mainly dealt with expository writing.

以前的对比修辞研究主要集中在说明文体裁上。

The explanatory article in encyclopaedia is a kind of expository writing.

百科全书条目释文是一种权威性辞书的说明文字 ，其语言朴实、简洁、严谨。

Courses include statistics, research methods, expository writing, and related topics.

课程还包括统计学，研究方法，说明文写作和其他相关主题。

Unfortunately, over the years, the research in this field has been focused on expository writing;

遗憾地是，这一领域的研究只限于说明文，对申请信函的研究却非常有限。