proluvial placer洪积砂矿
proluvial fan[地理] 洪积扇
proluvial deposit[地质] 洪积物
alluvial-proluvial plain冲洪积平原
ancient proluvial fan古洪积扇
buried proluvial fan埋藏洪积扇
alluvial-proluvial fan冲洪积扇
proluvial l placer洪积砂矿
inset proluvial fan嵌入型洪积扇