alluvium
/əˈluːviəm/ (bre, ipa) · /əˈluːviəm/ (ame, ipa) · /ə-ˈlü-vē-əm/ (ame, mw)
alluvium — 名詞
1. A layer or deposit of soil, mud, sand, gravel, and similar material that flowing
沖積層
河流沖積的泥沙沉積物
A layer or deposit of soil, mud, sand, gravel, and similar material that flowing water — such as a river or flood — carries and then drops onto land, often making the ground rich for growing crops.
The annual flood left a rich layer of dark alluvium across the Watanabe family's rice fields.
每年洪水都在 Watanabe 家的稻田上留下一層厚厚的黑色沖積層。
collocation: rich alluvium
Dr. Okafor discovered layers of ancient alluvium while digging near the river bank.
Okafor 醫師在河岸附近挖掘時發現了多層古老的沖積層。
The soil in this valley is mainly alluvium washed down from the mountains by the river.
這座山谷的土壤主要是從山上被河水沖刷下來的沖積物。
After the storm, dark alluvium covered the farmland close to the mouth of the river.
暴風雨過後，深色的沖積層覆蓋了河口附近的農田。
The fertile alluvium in the Nile Valley has supported farming communities for thousands of years.
尼羅河谷肥沃的沖積層數千年來一直養育著當地的農業聚落。
- sediment
Broader term; includes material deposited by wind, ice, or water, not only rivers.
- silt
Narrower; refers specifically to fine, dust-like particles, not gravel or sand.
- deposit
General term for any natural material left by a process; less specific than alluvium.
- loam
Refers to a mix of sand, silt, and clay in soil; alluvium can become loam but is not the same.
文法句型
alluvium + verb (deposit, form, cover)
adjective + alluvium (rich, fertile, ancient)
用法筆記
This term is most common in geography, geology, and farming contexts. It is typically uncountable ("the alluvium"), but some scientific writing uses alluviums or alluvia when referring to multiple distinct deposits or types.