包结构反映出高度的功能内聚性、低耦合性、以及强壮的个体从业者所有权。
Package structure reflects high functional cohesion, loose coupling, and strong individual practitioner ownership.
另一方面，引擎内部模块之间是通过内部接口相互调用，实现了各个模块的低耦合性，方便以后的维护和升级。
Secondly, internal engine modules can invoke others by interfaces, which make each loose modules be maintained and updated easily.
类是类结构的基本元素，本文研究了良好的类应当具备的四个基本特征：完整性和充分性、原子性、高内聚、低耦合。
Class is the basic element of class structure. It is research that class should hold four basic feature: integrality and sufficiency, primitiveness, high cohesion, low coupling in this paper.
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