This paper gives the detail description of the safe system structure and its function in the oil field automation. Also, it gives the basic steps for safety system design by using PLC.

这篇文章对安全保护系统在油田自动化中的作用及组成给予了详细的描述，也给出了用PLC设计安全保护系统的基本步骤。

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In detail design phase, this thesis gives data structure as well as key function description.

在详细设计阶段，本文给出了数据结构和关键函数的说明。

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Then we introduce the text prosodic level marking in detail, analyze the prosodic level structure of sentences, point out the pause principle in sentences and the description of lexical word.

接着对文本韵律层级标注作了详细介绍，分析了句子的韵律层级结构，指出句子内部的停顿原则以及语法词信息的描述。

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