如果您已经花费了大量的时间使用面向对象的语言，则您可能已经遇到了表达式问题的例子。

If you've spent a significant amount of time working with object-oriented languages, you've probably run into examples of the Expression Problem.

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AOP解决了面向对象和其它过程性语言未能处理的一块问题空间。

AOP addresses a problem space that object-oriented and other procedural languages have never been able to deal with.

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很多时候这个问题并没有明显的解决方案，即使面向对象语言也不能解决问题。

Many times the solution isn't obvious, and even object-oriented languages may not help.

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