What is the domain of all variables participating in a use case?
参与一个用例的所有变量的范围是什么？
The domain of discourse of input variables is divided firstly according to the changing degree of the process output while the input variables change.
首先按过程输出随输入变量变化的程度对输入变量论域进行划分，在此基础上确定模糊模型的规则总数和前件参数；
In contrast, in the time domain, variables are expressed as a function of time instead of frequency.
而在时间域中，因变量就是时间的函数而不是频率的函数。
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