sand stone sand source control area [經(jīng)濟(jì)學(xué)]沙源治理區(qū)sand sole sand soil layer [土木建筑工程]砂土層sand soil 砂質(zhì)土sand slime separator [經(jīng)濟(jì)學(xué)]砂泥分離器sand sheet 席狀砂；薄砂層；沙席；[地理] 小沙原sand shark sand sediment trap cleaning [土木建筑工程]窨井清掏sand sediment trap [經(jīng)濟(jì)學(xué)]沉沙槽sand riverbed [水利工程]沙質(zhì)河床sand quarry 采砂場sand pump bucket dredger [交通運輸工程]自揚鏈斗挖泥船sand prevention 防砂sand pit 砂坑；采沙坑sand piles sand pile sand pebble soil [土木建筑工程]砂卵石土sand papering machine [經(jīng)濟(jì)學(xué)]砂紙加工機(jī)sand paper [木] 砂紙