Each level is well defined and provides a distinct perspective of the system.
每个层次都是定义完善的，并提供了该系统的一个不同角度。
The system level is modeled from the perspective of the customer and the employee.
系统层次是从客户和员工的角度来建模的。
From the perspective of information theory, language is the most basic yet the most complicated information system and information carrier.
从信息论的观点看，语言是最基本也是最复杂的信息系统和信息形式。
From the perspective of information theory, language is the most basic yet the most complicated information system and information carrier.
从信息论的观点看，语言是最基本也是最复杂的信息系统和信息形式。
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