短语词组短语fine mix silt bond 细粉粒粘结fine particle silt 细颗粒泥沙fine mix silt 细沙cohesionless fine -silt layer 无凝聚性细粉砂层fine silt dam 粉细砂坝very fine silt 极细粉砂aquifer of fine silt 粉细砂含水层fine silt sand 粉细砂fine silt in xiamen 厦门海积砂 返回 fine silt