根轨迹法是古典控制理论的重要部分，是分析和设计线性定常控制系统的图解方法。
Root Locus is a important part of the classical theory of automation that is a diagrammatic method to analyse and design the linear system.
史密斯圆图图解法是通信中微波传输系统设计中的重要工具之一。
The illustrating method via Smith Chart is one of the important tools for the design of the transmission line problem in microwave communication.
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