alluvion

沙洲, 冲积地

alluvion

1. gradual formation of new land, by recession of the sea or deposit of sediment

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2. the rising of a body of water and its overflowing onto normally dry land; "plains fertilized by annual inundations"

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3. clay or silt or gravel carried by rushing streams and deposited where the stream slows down

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(substance-meronym) alluvial soil