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英语翻译The range of particle sizes encoutered in soils is very

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英语翻译
The range of particle sizes encoutered in soils is very wide:from around 200mm down to the colloidal size of some clays of less than 0.001mm.Although natural soils are mixtures of various-sized particles,it is commom to find a predominance occurring within a relatively narrow band of sizes.When the width of this size band is very narrow the soil will be termed poorly-graded,if it is wide the soil is said to be well-graded.A number of engineering properties,e.g.permeability,frost susceptibility,com-pressibilty,are related directly or indirectly to particle-size characteristics.
我也用过有道词典翻译过的~不要这些没技术含量的~希望大侠们专业点
在土壤中的粒子尺寸范围很广:从200毫米左右下降到少部分粘土比0.001毫米. 虽然自然土壤是各种大小的颗粒混合物,它经常会发现优势在一个规模相对狭窄的频段发生.当这种规模的频带宽度很窄的泥土被称为不良的分级,如果是广泛的土壤被认为是良好的分级,在工程的属性: 体积应变,
霜冻的敏感性,应对压力,直接或间接粒度特征有关.
encoutered---- encountered
commom-------------common