相反，本文将为您提供少量背景知识，考察这种格式的用法，并列出一些比较流行的处理这种格式的工具。

Instead, this article will give you a little background, review how the format is being used, and drop the names of some of the more popular tools for working with it.

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如下是一些可能比较有趣的表达式树的用法。

Here are some USES of expression trees that may be interesting.

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该API较显著的用法之一是用来比较实现、测量性能、对perl5语法的兼容性或其它标准之间的差异。

One of the clear USES of this API is to compare the differences between implementations, measuring performance, compatibility to Perl5 syntax, or other criteria.

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