你的父母不仅仅只是你父母的角色，他们，同我们一样，都是同时拥有很多优点和缺陷特质的复杂人类。
Your parents were not just your parents. They, like all of us, are complex beings with a mixed bag of character strengths and flaws.
上例中的角色检查有个很大的缺陷：你无法在运行时增删角色。
Checking for roles as in the example above suffers from one significant flaw: you can't add or delete roles at runtime.
Alan Cooper 1999年所介绍的概念，使用角色9是弥补缺陷的一个恰当的方法。
Using personas, a concept introduced by Alan Cooper in 1999, 9 is an appropriate way to fill this gap.
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