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泥石流最重度危险区内泥石流危害最严重或危害能力最强．论述了长江上游泥石流最重度危险区的泥石流形成条件，活动特征及发展趋势，总结了区内泥石流的防治现状，并提出了区内泥石流防治的原则和意见．
Debris flow in the most dangerous areas of the debris flow hazards the most serious or most hazardous. The debris flow formation conditions, active features and development trend of the debris flow in the uppermost reaches of the Yangtze River are summarized. The status quo of debris flow control in the area is summarized. The principles and opinions of debris flow prevention and control in the area are put forward.