A number of products have been developed which are permeable to air and water.一些既透气又透水的产品已开发出来。The sensory nerves directly cause the blood vessels to dilate and become more permeable.感觉神经直接引起血管扩张，增强其渗透性。The cell has a permeable membrane.细胞有一层渗透膜。The enemy's defences are permeable at several points.敌人的防御有好几处是可突破的。