The introduction typically begins with a general statement of the problem area, with a focus on a specific research problem, to be followed by the rational or justification for the proposed study.

引言一般以对该领域的简单描述开始，同时关注某一特定的研究问题，接下来是拟定研究的基本原理。

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The investigators found that when the study participants looked at faces matching their own race, a specific area of the brain "lit up" on the MRI.

据发表于《自然神经科学》上的报告所载，研究者们发现当受试者看到自己种族的人脸时，MRI显示其大脑中的一个特殊区域“亮”了起来。

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The specific topics of this thesis are as follows: Firstly, forest fire risk assessment system in the study area is established.

论文的具体研究内容如下：一是建立了研究区域内的森林火灾评价指标体系。

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