In the research of dust storm, the gale and soil moisture content of land surface are the two important factors which affect the occurrence of dust storm, and they are recorded by quantitative form.
在沙尘暴研究中，大风和下垫面的土壤湿度是影响沙尘暴发生的两个重要因子，它们分别以数值形式定量记录，但这种定量因子与沙尘暴发生的定性特征之间难以建立联系，从而影响了沙尘暴的定量研究。
The special topography, climate conditions and the underlying surface with the source of the abundant sand were the material base of forming sand and dust storm.
特殊地形、气候条件和富含沙尘源的下垫面是形成沙尘暴的物质基础；
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