根毛从土粒表面吸收养分，所以，土壤的内表面积对土壤中的植物养分有很大影响。
Root hairs feed from the surface particles, therefore the internal surface area has a great influence on plant food in the soil.
粗粒土具有良好的工程特性，广泛应用于当前的工程建设中，而且应用范围日益扩大。
The coarse-grained soils have the some good engineering properties and have been applied widely in the engineering construction.
它往往围绕着土粒以包膜的形式出现在土中，因而对土的性状影响很大。
Insoils it usually surrounds the soil particles as a coating, so it has great influence on the soil behaviors.
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