短语词组短語fine mix silt bond 細粉粒粘結fine particle silt 細顆粒泥沙fine mix silt 細沙cohesionless fine -silt layer 無凝聚性細粉砂層fine silt dam 粉細砂垻very fine silt 極細粉砂aquifer of fine silt 粉細砂含水層fine silt sand 粉細砂fine silt in xiamen 廈門海積砂 返回 fine silt