第一章为前言，主要介绍了常用于生物医学领域的纳米颗粒的种类及其制备方面的相关研究。
In chapter one, the variety and preparation of nanoparticles used mainly in fields of biomedical will be introduced.
第一章为前言，介绍了论文的选题背景和当前国内外的研究现状，并说明了本项研究的内容和意义。
The first one is preface, which introduces the background of this thesis and also illustrates briefly the content and significance of this research.
本文包括前言、正文、结论三部分，其中，正文部分的主要内容如下：第一章为地下空间开发利用概述。
The thesis consist of preface, text and conclusion. The text part mainly contains:Chapter one is the summary of underground space exploitation.
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