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。

youdao

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。

youdao

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。

youdao

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。

youdao