But what does the Boolean expression actually test for?
但是布尔表达式实际上测试什么？
You can also set up the Boolean expression to call a method.
也可以建立布尔表达式以调用方法。
The third part of the traversal expression is a Boolean expression.
遍历表达式的第三部分是布尔表达式。
Similarly, take any Boolean expression. Could you just reverse it?
逻辑表达式，是否可以将它取反？
Similarly, take any Boolean expression. Could you just reverse it?
逻辑表达式，是否可以将它取反？
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