如果所有的基础方程都是线性的，那么该系统也是如此。

If all elemental equations are linear, so is the system.

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如果所有的基础方程都定义于整个时间过程，那么，该系统就是连续时间系统。

If all elemental equations are defined for all time, then the system is a continuous-time system.

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如果一个或多个基础方程是非线性的，例如在应用二极管的场合，那么整个系统也就成了非线性的。

If one or more elemental equations are nonlinear, as is the case for a diode, then the overall system is nonlinear.

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