“坏帐银行”则继承了原银行的不良资产和剩余的资本——资产标价降低后，资金自然会有所不足。
The "bad bank" inherits the bad assets and the rest of the capital - which, after appropriate markdowns of the assets, will not be enough.
OOAD试图找到最优的对象和最自然的类继承来实现它们。
OOAD attempts to find the optimal set of objects and the most natural class hierarchy to implement them.
也就是，一个“顾客”是“一种”用户，一个PA也是“一种”用户，从表面上看来这很自然地适合反映那些关系的继承层次结构的类型。
That is, a Customer "is-a-kind-of" user and a PA "is-a-kind-of" user, which on the surface seems like a natural fit for the type of inheritance hierarchy that reflects those relationships.
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