单词：alluvial soils
alluvial soils的用法和样例：
例句
- Because the region around New Orleans is composed of alluvial soil, there is no paving material close at hand.新奥尔良一带多为冲积土，因而附近没有可用的铺路石材。
- Yet the soft alluvial sediment of Tokyo's low-lying areas, it is now understood, is vulnerable to liquefaction, in which violent movement turns the soil to quicksand.人们现在意识到了，东京的一些地势低的地方，松软的冲积土很容易受到液化作用的影响，强烈的运动会使土壤成为流沙。
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