model unknown的用法和樣例：
例句
- Simulation results showed that the proposed approach could achieve the robust tracking of the unknown nonlinear system.
模擬結果表明，該方法能對模型未知仿射非線性系統實現魯棒輸出跟蹤。 - The learning algorithm can effectively control the unstabl nonlinear system, even if the model of the system is not available and the learner has no a priori experience.
該學習演算法在模型未知和沒有先驗經驗的條件下，能通過自身神經網路的在線學習，有效控制不穩定的非線性系統。
