Reason about the data in the expression tree, and do custom processing over it.
推断表达式树内数据，并对它做自定义处理。
Use the .Compile() method to turn the expression tree into a delegate so that you can execute it.
用.Compile()方法去将一个表达式树转换为一个委托，然后你可以执行它。
Instead, it can analyze the expression tree, discover what you want done, and then decide how to do it.
查询的执行次序和途径并非强制指定的，相反，它可以对表达树进行分析，以发现你所期望的结果，然后再决定如何处理；
One proposed option would be passing in some source code and being returned an expression tree instead of just a compiled assembly.
另一种可能是传入一段源代码并返回一颗表达式树，而不是一个编译好的程序集。
An expression tree is a data representation of the lambda expression in a form that is easy for you to read and reason about the lambda expression in.
表达式树是lambda表达式的一种数据表示形式，它能使你更方便地读取和推断lambda表达式。
Defines a function node in a query expression tree.
定义查询表达式树中的函数节点。
Defines the literal node in a query expression tree.
定义查询表达式树中的文字节点。
A less complex provider might examine only one method call expression in the expression tree that represents the query, and let the remaining logic of the query be handled elsewhere.
复杂度较低的提供者可能只会在代表查询的运算式树状架构中检查一个方法呼叫运算式，并让查询的其馀逻辑在其他地方处理。
A less complex provider might examine only one method call expression in the expression tree that represents the query, and let the remaining logic of the query be handled elsewhere.
复杂度较低的提供者可能只会在代表查询的运算式树状架构中检查一个方法呼叫运算式，并让查询的其馀逻辑在其他地方处理。
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