In system design, firing system of kiln is a multi-variant coupling non-linear system, which is the difficulty of system control.
在系统设计中，窑炉烧成系统作为一个多变量耦合的非线性系统，是控制的难点。
DC-DC switching converter is a time-variant and non-linear dynamic system, and it is difficult to analyze and design.
DC开关变换电路是一个时变的、非线性的动态系统，它的分析与设计一直是一个难题。
The street system, which brought non-unit multitude into unified streets and lane organizations, was actually a variant form of the unit system.
街居组织实际上是一种单位的变体，它以居住场所为基点，把非单位人口纳入到统一的街道、里弄组织内部。
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