短語(yǔ)詞組短語(yǔ)marginal sand sheet 邊緣席狀砂delta front sand sheet 前緣席狀砂sheet sand 厚度均勻的砂巖層;平伏沙層;層狀砂層sheet sand covered 片沙覆蓋loch sheet sand 濱淺湖席狀砂coverage with sheet sand 片沙覆蓋frontal sheet sand 前緣席狀砂 返回 sand sheet