短语词组短语sand and gravel 砂砾石;砂卵石层sand -gravel fan 砂砾岩扇体sand and gravel strata 砂卵石地层replacement sand -gravel 换填砂砾sand and gravel culture 砂田栽培sand and gravel drilling 砂砾石层钻探waterin sand and gravel 岩土中的水 返回 sand gravel