短语词组短语marine sand borrow pit 采海沙坑sand storage pit 储沙坑Sand -pit's form 沙坑形状rectangular sand -pit 矩形河道desilting sand pit 隔沙池;隔沙井deposited sand pit 沉积沙地clay and sand pit 泥沙矿坑sand pit ball 沙坑球 返回 sand pit