| 单词 | alluvial fan |
| 释义 | alluvial fan in British English or alluvial cone noun a fan-shaped accumulation of silt, sand, gravel, and boulders deposited by fast-flowing mountain rivers when they reach flatter land alluvial fan in American English a gradually sloping mass of alluvium that widens out like a fan from the place where a stream begins to slow down |
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