两种群落钉螺分布密度不同程度受长江洪泛的影响；

The distribution density in both communities was affected by the flood of the Yangtze River.

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该算法维持了洪泛的优点，同时又降低多余消息的产生。

A selecting flooding algorithm is proposed. It can keep quick response time to flooding while it decreases redundant messages.

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该文研究了多限制路径选择问题，提出了一种基于有限选择洪泛的源路由预计算的服务质量路由算法。

This paper discusses the NP-complete multi-constrained path problem, and a precomputation source routing algorithm based on limited selective flooding is presented.

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