semi-permeable membrane的用法和样例：
例句
- Desalination is carried out by simply lowering into the ocean a long, hollow pipe capped at the lower end by a semipermeable membrane.
用一根长空心尼龙管插入海水里，并用半透膜封住较低的一端来进行海水淡化。 - The solvent, in this case water, is passed through the membrane while the impurities are collected at the membrane's surface.
这样，便使水通过半透膜，而杂质则聚集在膜的表面上。
