primary soil formation process 原生土壤形成过程
primary soil type 初级土壤类型
primary soil structure 原生土结构
soil texture primary soil 土质初育土
soil primary mineral 原生矿物 ; 土壤原生矿物
primary saline soil 原生盐土
primary salinized soil 原生盐渍土
soil primary shear surface 与机具前进方向平行的
The Huangshui basin is the industry and agriculture production base in the Qinghai province, and also is the primary soil and water losses area of the Qinghai province.
湟水流域是青海省工农业生产基地，也是青海省主要水土流失区。
The primary growing medium, what the plants draw nutrients from, is actually soil, not water.
主要的生长介质，也就是植物吸收营养的来源，实际上是土壤，而不是水。
Foundation deformation is one of the primary research topics of soil mechanics.
地基变形是土力学中的主要研究课题之一。
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