可扩展性，也是一个大问题。
PBD is BBD's matureness and extendability, it extends design reuse idea and emphasizes system reuse.
PBD方法是BBD方法的成熟和扩展，它延伸了设计重用的理念，强调系统重用。
Persistence layers can greatly increase maintainability, extendability and portability of applications through encapsulation of persistence mechanisms.
持久化层通过封装对持久化机制的访问大大提高了应用系统的可维护性、可扩展性和可移植性。
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