alluvial-fan plain冲积扇平原
alluvial-fan terrace冲积扇阶地
alluvial-fan冲积扇体系
alluvial l fan冲积扇
alluvial diluvial fan冲洪积扇
alluvial l fan deposit冲积扇层
compound alluvial fan复合冲积扇;[地质] 复合冲击扇;衬合冲积扇
subaqueous alluvial fan水下冲积扇
N（名词） a fan-shaped accumulation of silt, sand, gravel, and boulders deposited by fast-flowing mountain rivers when they reach flatter land 冲积锥; 湍急的河水到达平地后形成的由泥、沙、石、卵组成的锥形沉积物