first-order model的用法和樣例：
例句
- Then the high order model was reduced by the modal aggregation method.
采用模態(tài)集結法對其高階模型進(jìn)行降階。 - The time domain and frequency domain analysis methods were used to verify the simplified model of the Nimu arch bridge in Tibet as an example.
以西藏尼木大橋作為算例，通過(guò)頻域分析和時(shí)域分析來(lái)驗證降階模型的有效性。
