尽管中国有悠久历史，但利用历史洪水展延洪水频率曲线以求稀遇设计洪水，仍感困难和不可靠。
Although there is a long history in China, it is very difficult and unreliable to extrapolate frequency curve to long recurrence design floods.
尽管中国有悠久历史，但利用历史洪水展延洪水频率曲线以求稀遇设计洪水，仍感困难和不可靠。
Although there is a long history in China, it is very difficult and unreliable to extrapolate frequency curve to long recurrence design floods.
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