The effect of abnormal winter monsoon on the precipitation during raining season is significant over lower-middle reaches of the Yangtze River basin.
冬季风异常对中国大部分地区，特别对中国长江中下游地区的降水影响较大。
The disaster flood in the middle and lower plain of the Yangtze river basin can be qualitatively classified as 2 kinds: basin flood and regional flood.
长江中下游平原区成灾大洪水，一般定性区分为两类：流域性洪水、区域性洪水。
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