代码的含义是这样的：，我有一个表达式，我会去对这个表达式求值。
That code says the following: the IF says, I've got an expression, I'm going to evaluate it.
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。
In Listing 2, the program will evaluate the expression four times, once for each tuple.
本文分析了一个applet，它能一步一步的对算术表达式求值。
This article examined an applet that has the ability to evaluate arithmetic expressions step by step.
事件订阅包含筛选器，这是一个布尔表达式，对所订阅的事件求值为True，对其他所有事件求值为False。
An event subscription contains a filter, which is a Boolean expression that evaluates to true for events it subscribes to and to false for all other events.
事件订阅包含筛选器，这是一个布尔表达式，对所订阅的事件求值为True，对其他所有事件求值为False。
An event subscription contains a filter, which is a Boolean expression that evaluates to true for events it subscribes to and to false for all other events.
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