浏览器可以以URL形式询问服务器不同的问题并将打包成请求参数和POST数据的提示一并传递，但它其实并不 “讲” 服务器的语言。
The browser can ask the server different questions in the form of URLs and pass along hints packaged as request parameters and POST data, but it doesn't really speak the server's language.
询问语言使用户更容易对数据库进行操作。
Query languages make it easier for users to deal with databases.
介绍数据库逻辑询问语言的基本概念和询问求值的方法，并扼要介绍逻辑询问语言的研究现状和研究方向。
This paper introduces the basic concepts of logical query languages for databases and the methods on evluation of queries.
介绍数据库逻辑询问语言的基本概念和询问求值的方法，并扼要介绍逻辑询问语言的研究现状和研究方向。
This paper introduces the basic concepts of logical query languages for databases and the methods on evluation of queries.
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