短语词组短语pervious embankment 透水路堤pervious shell 滤层Pervious blanket 透水毛毯;排水层pervious tunnel 透水衬砌pervious indexes 透水指标pervious drainagelayer 多孔排水层pervious hose 透水软管pervious area 透水地面pervious layer 透水层 返回 pervious