higher-order system的用法和样例：
例句
- The compactness and utility of this notation becomes apparent when high order systems are considered.
当研究高阶系统时，这种表示方法就显得很紧凑和有用。 - Then, it is possible to define a state-space representation of the fractional model, which permits to approximate the continuous-time response of an ideal system.
然后，可以定义非整数阶模型的状态方程实现，它允许近似理想非整数阶系统的连续时间响应。
