soil region meaning in Chinese

土壤地区
土壤区

Code for design of soil and foundation of buildings in frozen soil region
冻土地区建筑地基基础设计规范
Building code for saline soil region
盐渍土地区建筑规范
Construction in expansive soil region by view of system engineering
用系统工程的观点进行膨胀土地区的施工
Study of highway waterproof and drainage technology in expansive soil region
膨胀土地区公路防排水技术研究
Probe into treatment measures for main channel slope in expansive soil region
总干渠膨胀土渠坡处理措施探讨

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