A brief section giving background information may be necessary, especially if your work spans two or more traditional fields.

对背景知识做一个简要的介绍有时候也是必要的，特别是当你的研究领域涉及到两个或更多方面的传统领域。

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This paper gives a brief introduction on chloroacetyl chloride such as its preparation, application in medicine and pesticide fields, and it's market prospect.

介绍了氯乙酰氯的生产概况，叙述了氯乙酰氯在医药、 农药等领域的应用情况以及氯乙酰氯的市场前景。

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This paper is a brief introduction of the calculating principle and method of the transient temperature fields and the residual stress fields in the casting during the process of solidification.

本文扼要介绍铸铁件在浇注后凝固过程中瞬时温度场及残余应力场的计算原理和方法。

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After a brief period spent working in the fields, Hagman followed his mother into showbusiness and even toured with her.

BBC: Obituary: Larry Hagman

Helpfully, the Times lists approximate salaries and brief explanations of why the top fields are growing, and also the necessary education required.

FORBES: Jobs of the Future