The analyzed results show that the strong and very strong dust storm has mainly decreased since 1955, but increased in the late 1990s.
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.
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；
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