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生产堤的存在改变了洪水正常的演进规律；
The production levee changes the natural law of flood evolution.
股份合作制是符合产权演进规律的公有制实现形式之一。
Share cooperated System is one form of public ownership in accordance with ownership derivation.
因此，研究堤防溃决之后洪水在城区内的演进规律具有重要的现实意义。
Therefore, it is of great significance to study the routing characteristics of flood caused by levee breach.
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