free-surface的用法和樣例：
例句
- The distance from the impermeable base to the free surface is a function of space and time.
由隔水底板至自由面的距離是空間和時間的函數。 - The influence of surface tension effect on the nonlinear hydrodynamics stability of a thin micropolar liquid film flowing down along a vertical cylinder is investigated.
摘要本文利用長波微擾解所得到之廣義自由面運動方程式，探討直立圓柱面上微極流體薄膜流表面張力效應所表現之穩定性。
