wall surface class的用法和樣例：
例句
- In order to improve hydrodynamic performance of a ferrying raft, two hydrofoils are set in the raft's wetted hull, which will control the flow field near the wall surface.
摘要為了改善門橋的水動力性能，增設了對近壁面流場進行流動控制的水翼。 - The statistf water surface fluctuation below downstrearn gyre of surface flow energy dissipation aredescribed.
論述了面流消能下游旋滾后水面波動的統計特性。
