permselective

Aren't all membranes semi-permeable? That is, the whole point of a membrane is that it lets some things through and others not. Membranes by definition are permselective or semi-permeable barriers.

也就是说他认所有的都是半的，从定义来看就是选择过或者半结构。

The membrane can be used for concentrating ethanol from dilute ethanol-water mixture through pervaporation process owing to its alcohol-permselective properties.

通过对低浓乙-水的渗蒸发的试验研究，表明该是一种性能较好的新型优先。