主题可以增加一个前言，其中包括简短描述和其他可选的元数据。
A topic can be augmented by a prolog, a short description, and other optional metadata.
但也不总是这样：正如在前言中描述的那样，安德鲁·布莱·巴特在爆出雪莉•谢罗德这个故事的时候并没有隐藏自己的身份。
Not always, however: Andrew Breitbart did not hide when he "broke" the Shirley Sherrod story, as described in the Introduction.
如果你缴交的是小说的一部份，写一份短的前言(1 - 2段)描述你对小说的计划并且告诉读者这一部份将会在何处出现。
If you submit a novel segment, write a brief prologue (1-2 paragraphs) in which you describe your plans for the novel and tell the reader where the segment will appear.
前言：目的：对临床护理人员标准防护措施实施状况进行描述。
Objective: the descriptive study aimed to identify the standard precautions practice of clinical nurses.
但也不总是这样：正如在前言中描述的那样，安德鲁•布莱巴特在爆出雪莉•谢罗德这个故事的时候并没有隐藏自己的身份。
Not always, however: Andrew Breitbart did not hide when he"broke"the Shirley Sherrod story, as described in the Introduction.
前言：本文描述了《过滤用玻璃纤维针刺毡》行业标准的修订过程和标准报批稿的主要内容。
This article describes the revising process of Industry standard "Fibreglass Needled Felts for Filtration" and the main contents of the standard draft reported for approval.
前言：描述了球形测试装置的结构，测试原理和测试步骤，并测试了七氟丙烷对甲烷和戊烷的惰化体积分数。
The essay article introduces the structure of the inerting apparatus, the test principle, the test procedure and the determination of inerting concentration.
前言：本文描述了平板太阳热水系统在工程应用中抗冻防冻，经济实用，自动控制等诸多优点，也对系统的开发和实现进行了探讨。
This paper introduces Some advantages Such as: antifreezing, efficiency intelligence of the flat plate-type Solar hot water system and discusses the development and realization of the system.
前言：目的：描述老人院痴呆患者激越行为的主要表现及其特点。
Objective: To describe the manifestations and characteristics of agitation in nursing home dementia patients.
前言：目的：描述老人院痴呆患者激越行为的主要表现及其特点。
Objective: To describe the manifestations and characteristics of agitation in nursing home dementia patients.
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