书的前言很好的介绍了MongoDB所涉及的概念，将这些新概念跟我所熟悉的关系数据库中的概念联系在一起。
The introduction does an excellent job of introducing the concepts behind MongoDB, bridging them to the relational database concepts I already know.
前言介绍了我国研究小额诉讼程序的社会背景及意义。
The foreword introduces the social background and the significance to study small claims procedure in our country.
本文在前言部分介绍了职务犯罪的客观现实和理论研究现状，阐述了研究职务犯罪的目的。
The preface introduces the objective reality and present condition of the study, expounds the aim of studying duty crime.
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