The foreword introduces the background, the substance, the value and main thoughts of this topic study.

该部分阐述了本文的研究背景、研究主旨、研究价值及研究思路。

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Question answer System is a subject of great topic study orientation in studying natural language processing, mainly including question analysis, information retrieval and answer collection.

自动问答系统是自然语言处理研究中的一个热门的研究方向，主要集问题分析、信息检索、答案抽取等于一体。

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Students have the freedom to focus on whatever topic or subject that they are interested in and study it in depth through the internet.

学生可以自由地专注于他们感兴趣的任何主题或学科，并通过互联网深入研究。

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Topics covered also ranged widely and these different approaches were itself was a topic of study (question 5).

UNESCO: Article on assesment

For example, the New College of the Humanities will offer a liberal arts education of the kind which will be familiar to American readers and is so lacking in Europe, where most generally students must pick a topic of study (often vocational) upon their leaving the secondary school system.

FORBES: Does Higher Education Need To Go Back To The Fifties?

When computer models gave him the power to spin up winds on planets of the mind, his first big topic was a study of the net effects of smoggy pollutants in the atmosphere, which cool the planet down, and the carbon dioxide which warms it up.

ECONOMIST: Steve Schneider