研究表明，河西走廊强和特强沙尘暴自1955年以来主要呈下降趋势；
The analyzed results show that the strong and very strong dust storm has mainly decreased since 1955, but increased in the late 1990s.
随沙尘天气强度逐渐加强（即从背景大气到浮尘、扬沙、沙尘暴、强及特强沙尘暴），它们的地面沙尘浓度约按3倍的比率依次递增；
With the intensifying of the dust weathers, the dust thickness, total suspended particulates (TSP) of dust at the surface will increase in geometric series at the rate of 3 times.
随沙尘天气强度逐渐加强（即从背景大气到浮尘、扬沙、沙尘暴、强及特强沙尘暴），它们的地面沙尘浓度约按3倍的比率依次递增；
With the intensifying of the dust weathers, the dust thickness, total suspended particulates (TSP) of dust at the surface will increase in geometric series at the rate of 3 times.
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