In the preface, it introduces the origin of selecting the topic, limits the object to be studied and briefly narrates the key points and difficulties in the paper.
绪言部分概要介绍了本文的选题缘起、界定了研究对象，并简要说明了本文的重点、难点。
Here the "timely", including the timely review after class, three minutes of time to close your eyes to review the key points and difficulties, noon lunch break to review again, up to five minutes.
这里的“及时”，包括下课后及时复习，三分钟的时间闭上眼睛回顾本课重点和难点，中午午休要再次复习，至多五分钟。
For the ROV status and difficulties of subsea manipulators and underwater tools, key points are discussed and analysed, and trends and Suggestions are given for the future research work.
然后分别针对水下机械手的研制思路和水下作业工具的研究状况及难点等进行了分析与评述，给出了相关建议。
At the same time, analyzes the difficulties and key points of CDHPWHU's design, for example, high-temperature reliability, defrosting, the water level control and so on.
同时针对直热式热泵热水机组的高温可靠性、除霜、水位控制等关键点的设计要点进行分析。
Some corresponding technologies and key points were proposed for the processing difficulties of the thin and long axes of austenitic stainless steel.
针对奥氏体不锈钢细长轴难以加工的特点，提出了对其加工相应的工艺方法及注意事项。
Implementing ISO14001 standard is becoming more and more popular. Enterprises must grasp the key points and come over the difficulties in order to establish EMS successfully and efficiently.
实施ISO 14001标准建立环境管理体系正成为越来越多企业的选择。在这一过程中，只要把握重点，克服难点，环境管理体系便能建成并有效运行。
Implementing ISO14001 standard is becoming more and more popular. Enterprises must grasp the key points and come over the difficulties in order to establish EMS successfully and efficiently.
实施ISO 14001标准建立环境管理体系正成为越来越多企业的选择。在这一过程中，只要把握重点，克服难点，环境管理体系便能建成并有效运行。
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