free-surface的用法和样例：
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离是空间和时间的函数。 - 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.
摘要本文利用长波微扰解所得到之广义自由面运动方程式，探讨直立圆柱面上微极流体薄膜流表面张力效应所表现之稳定性。
