短語詞組短語sand and gravel 砂礫石;砂卵石層sand -gravel fan 砂礫巖扇躰sand and gravel strata 砂卵石地層replacement sand -gravel 換填砂礫sand and gravel culture 砂田栽培sand and gravel drilling 砂礫石層鑽探waterin sand and gravel 巖土中的水 返回 sand gravel