So the greenhouse is a multi-variable coupled, time-varying and non-linear complicated system.

因此，温室环境是多变量耦合、时变、非线性的复杂系统。

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The PM brushless DC motor is a multi-variable and non-linear system.

永磁无刷直流电机控制系统是多变量和非线性的。

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Steam generator level is a non-linear, mutative and multi-variable system. It is a problem to design the control system because of "false level".

蒸汽发生器水位控制系统是非线性、时变的多变量系统，“虚假液位”现象的存在使蒸汽发生器液位控制成为一个难题。

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