alluviation

n. 沉积作用

例句与用法：

Bangkok is surrounded by a vast, damp, alluvial plain, crisscrossed by a network of klong.

曼谷为一个广阔潮湿的冲积平原所环绕，有纵横交错的运河网。

Low-lying alluvial land adjacent to a river.

低洼地，滩地与河流邻接的低洼冲积地带