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。
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。
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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