摘要：<正>沙尘肆虐3月20日,北京、天津等13省区受到沙尘天气影响,这次沙尘天气是自2009年1月份以来影响中国范围最大、强度最强的沙尘天气过程。On March 20,13 provinces and regions with Beijing andTianjin included were affected by a sandstorm,the worst since Januarylast year in terms of its covered area and intensity.

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