...C# 3.0语言并没有为查询表达式指定确切的执行语义，而是将查询表达式翻译为对附着于查询表达式模式（Query Expression Pattern）的方法的调用。
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您使用相同的基本查询表达式模式来查询和转换SQL数据库、A DO。
You use the same basic query expression patterns to query and transform data in SQL databases, ADO.
查询表达式基于编译器的模式转换，除了相关查询表达式需要的模式之外，你不必实现其它的；
Query expressions are based on compiler translations of patterns; you don't need to implement any more of the pattern than the relevant query expression requires
查询表达式通过依次重复应用下述转换进行处理。每个转换被应用，直到不出现指定的模式为止。
A query expression is processed by repeatedly applying the following translations in order. Each translation is applied until there are no more occurrences of the specified pattern.
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