理解这种区别的最好方式就是，子系统是逻辑的，但是位置是物理的。
The best way to understand the distinction is that subsystems are logical, whereas localities are physical.
主要的区别来自如何放置和实现业务逻辑或查看呈现逻辑。
The main differences come from how you place and implement business logic or view rendering logic.
下面说明概念模型与逻辑模型之间最大的区别
The following define the most significant differences between the conceptual and logical models
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