资料来源 : pyDict

冲积层,冲积土

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Alluvium \Al*lu"vi*um\, n.; pl. E. {Alluviums}, L. {Alluvia}.
   [L., neut. of alluvius. See {Alluvious}.] (Geol.)
   Deposits of earth, sand, gravel, and other transported
   matter, made by rivers, floods, or other causes, upon land
   not permanently submerged beneath the waters of lakes or
   seas. --Lyell.

资料来源 : WordNet®

alluvium
     n : clay or silt or gravel carried by rushing streams and
         deposited where the stream slows down [syn: {alluvial
         sediment}, {alluvial deposit}, {alluvion}]
     [also: {alluvia} (pl)]