a
llu
vion
复数形式
alluvions
1
冲积, 洪水
the rising of a body of water and its overflowing onto normally dry land
2
冲积层, 冲积沉积物
clay or silt or gravel carried by rushing streams and deposited where the stream slows down
3
冲积, 冲积沉积物
the slow expansion of land due to water movements