The advantage of MapReduce is that it allows for the distributed processing of the map and reduction operations.

MapReduce的优点是它允许对映射和缩减操作进行分布式处理。

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And flood risk map contains comprehensive information such as area nature, socio-economy and flood calamity, so it can play an important reference role in flood prevention and reduction.

洪水风险图综合自然、社会经济和洪水灾害等多种信息，在防洪减灾中可发挥重要参考作用。

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