Design principles: Validates that your code adheres to the design principles of object-oriented programming.
设计原则：验证你的代码是否坚持面向对象编程的设计原则。
Two responsibility assignment principles play a major role in achieving good object-oriented design: high cohesion and low coupling.
这两个职责分配原则在完成良好的面向对象设计的方面扮演了主要角色：高内聚和低耦合。
Design principles (5) : Rules for design principles of object-oriented programming.
设计原则(5)：用于面向对象编程的设计原则的规则。
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