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根据2009年天气等因素进行分析,预计今年重庆市主要农作物病虫发生程度为3~4级,发生面积7020万亩(次)左右。
According to the 2009 weather and other factors for analysis, it is estimated that the main crop pests and diseases in Chongqing this year, the level of 3 to 4, the occurrence of an area of 7020 mu (times) or so.