结构和关键词
网络释义
◎ 结构和关键词（Structures and Key Words） 介绍段 背景句 1 环境恶化（environmental degradation）已经被认为是一个我们在21世纪需要征服（overcome）的挑战 。
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双语例句原声例句
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关键词特性描述非结构化文本内容中出现的单词和短语。
The keyword features describe the occurrences of words and phrases in the unstructured text content.
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通过对查询短语的结构分析，发现查询短语通常由关键词和特征词构成。
By analysis of query phrase structure, the author finds that the query phrase is generally composed of both keyword and the feature word.
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第一章介绍论文的背景、原理和必要性，同时列出关键词的解释以及论文的结构。
Chapter One focuses on the background, rationale and necessity of the study, and gives the term definitions and overall structure as well.
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Now if you look at the structure of this book, it has sections that say Key Points and Key Terms.
如果你看了整本书的结构,就会看到有个关键点和关键词的部分
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