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Alluvium is the soil itself — the sand, silt, clay, and small stones that rivers, lakes, and floods leave behind. After a flood, the new layer on the fields is alluvium. Over many years it can grow into a thick bed. This is a geography and geology word. In ordinary talk, people say mud, silt, or “the soil the river left.” Gold and other minerals sometimes sit in alluvium, which is why you hear of alluvial gold: gold that water has washed down and dropped, rather than gold still locked in rock.
沖積土；沖積層
組成From Medieval Latin alluvium, “matter deposited by flowing water,” the neuter of alluvius (“deposited by a river”), from Latin alluviō (“washing upon, overflowing”). The al- is the “to / against” prefix.
同家族的字
- alluvialthe adjective: made of this soil
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
alluviumnoun
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soil, clay, silt or gravel deposited by flowing water, as it slows, in a river bed, delta, estuary or flood plain
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。