这是一种新型表达式语言，拥有优秀的集合、对象图遍历和索引支持功能。

This is the newer form of expression languages and has excellent collection, object graph traversal, and indexing support.

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我们可以在这编写一个表达式来匹配许多类的方法的集合。

We could write an expression here that matched a set of methods, on many classes.

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抽象语法树是一个表示为对象集合的表达式。

An abstract syntax tree is an expression represented as a collection of objects.

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