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。
Map and grep evaluate a block or an expression for each element of a list.
Map和grep对列表的每个元素计算块或表达式。
Map and grep evaluate a block or an expression for each element of a list.
Map和grep对列表的每个元素计算块或表达式。
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