Methods To contrast the disparity of soil type, soil use, and basic characteristics, in particular microelement contents in high_mortality area and low_mortality area of esophageal cancer.
方法对比食管癌高、低死亡率区土壤类型、利用方式及土壤一般特性，尤其是在微量元素含量上的差异。
Structure is one of the intrinsic characteristics of soil, moreover, it is a basic factor that determines the mechanics behavior of soil.
结构性是土最为内在的根本特性之一，它是决定土的力学特性的一个根本因素。
Tensile properties of single roots which is the important part of the plant roots biomechanical characteristics, is the research basic of plant roots on soil reinforcement.
植物单根抗拉特性是植物根系生物力学特性的重要组成部分，是研究植物根系固土作用的基础。
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