There are five parts in this thesis. Chapter One introduces related research backgrounds.

本文分五部分内容：第一章，介绍本文的相关研究背景。

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In the preface, I first introduced the research backgrounds research purpose and method of this paper.

本论文首先在引言部分介绍了该论题的研究背景、研究目的和研究思路。

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Part one is the introduction which provides the research backgrounds, the discussion of the purpose and the significance of the study.

第一部分为引言，就研究背景、现实意义和内容和方法做论述。

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Research shows that those from poorer backgrounds are more likely to lead unhealthy lives.

BBC: Why are we so unhealthy?

The number of pregnant smokers has remained static since 1992, and research has indicated that women from poorer backgrounds are three times more likely to smoke than those with higher incomes.

BBC: Helpline for pregnant smokers

They were meant as research for exotic genre scenes or for the backgrounds of ambitious paintings of episodes from mythology or Roman history all idealized in the finished work.

WSJ: Appealing to Modern Eyes | The Path of Nature | Metropolitan Museum of Art | By Karen Wilkin