Each expression class has an evaluate method, and an enumerate method.
每个表达式类都有一个evaluate方法和一个enumerate方法。
In this particular regular expression, we encounter the '[[: space:]]' character class.
在这个特别的规则表达式中，出现了' [[：space：]] '字符类。
Each expression class has a simplify method, to allow expression rewriting.
每个表达式类都有一个simplify方法，以允许表达式重写。
This is a base class for other code expression objects that is never instantiated.
这是其他从不实例化的代码表达式对象的基类。
Expression in Class May I come in?
课堂用语我能进来吗？
Expression in Class May I come in?
课堂用语我能进来吗？
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