The skin of amphibians is permeable to water.
两栖动物的皮肤是透水的。
Devising a suitable membrane-tough enough to withstand the pressure while remaining permeable to water but not to salt-is harder than it sounds.
设计一种适合的膜非常困难：一方面要足够坚韧，以承受压力；但同时还要有渗透性，而且只能透水，不能透盐。
A number of products have been developed which are permeable to air and water.
已开发出许多可渗水透气的产品。
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