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。
Introduces work principles of two adding pressure establishments for high-place fire protection water tank;
介绍当高位消防水箱压力不足时常用的两种增压设施的工作原理；
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