Soil erosion investigation is a quite complicated task.
土壤侵蚀调查是一项十分繁复的任务。
Experimental investigation of heat and water transfer of sandy soil with air convection was done.
实验上，对大气对流环境条件下土壤内热、水分迁移过程进行了研究。
The investigation of low hill red soil area.
低丘红壤资源调查。
The investigation of low hill red soil area.
低丘红壤资源调查。
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