每种Shell都有一个内置命令的分类；PATH环境变量用于指定搜索的列表和目录；而别名可以作为简写。
Each shell has an assortment of built-in commands; the PATH environment variable specifies the list and order of directories to search; and each alias ACTS as shorthand.
MediLexicon：在MediLexicon站点，你可以使用医药字典搜索、医院搜索、医药简写搜索或者阅读所有最新的医药新闻。
MediLexicon: at MediLexicon, you can use the medical dictionary search, hospital search, medical abbreviations search or read all the latest medical news.
DataParkSearch Engine：利用这个开源搜索引擎可以找到多种语言站点，实现“基于缩写词和简写词的模糊搜索”和搜索文本文件，mp3文件和gif文件。
DataParkSearch engine: Use this open source search engine to find multilingual sites, pull up "fuzzy searching based on acronyms and abbreviations" and find text files, mp3s and.gif files.
DataParkSearch Engine：利用这个开源搜索引擎可以找到多种语言站点，实现“基于缩写词和简写词的模糊搜索”和搜索文本文件，mp3文件和gif文件。
DataParkSearch engine: Use this open source search engine to find multilingual sites, pull up "fuzzy searching based on acronyms and abbreviations" and find text files, mp3s and.gif files.
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