沿着山脚的一些冲积扇可能联合起来形成连续的冲积坡。
A number of alluvial fans along the base of a mountain may coalesce to form a continuous alluvial slope.
根据成因蓝宝石砂矿层分为冲积砂矿层、洪积砂矿层和残坡积砂矿层；洪积砂矿层中蓝宝石最富。
According to I ts origin, sapphire sand strata are divided into sand wash stratum, pluvial stratum and relict drifted sand stratum, while sapphire concentrated well in drifted sand stratum.
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