In Listing 2, the program will evaluate the expression four times, once for each tuple.

在清单2中，程序将对表达式进行四次求值，每次对一个元组求值。

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It will iterate over each element of the idx sequence, evaluate the expression, and add the result to the return sequence.

它将迭代id x序列中的每个元素，求得表达式的值，并将结果添加到这个返回序列。

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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。

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To evaluate the expression, each class in this structure has an evaluate() method, which is responsible for returning its value.

要对表达式求值，该结构中的每个类都有一个evaluate()方法，它负责返回表达式的值。

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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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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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