river model tests的用法和樣例：
例句
- Roughening in river models is a very important method to meet resistance similarity.
河工模型是解決江河治理及大型水利水電工程泥沙問題的主要手段。 - By the calculating of the distorted models and the undistorted model of the circumfluence, the effect of the distortion ration on the flow is analyzed.
採用平面二維模型，在數學模型的基礎上，計算變率使河工模型彎道水流在相似性上產生的影響。
