Inverted Index: The map function parses each document, and emits a sequence of pairs.

反向索引：map函数对每个文档进行索引分析，产生一串数据对。

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Then, rainfall estimated by radar data is inverted from the sequence of Z-I relation.

然后，用这组关系得到降雨的雷达估算值。

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Then, rainfall estimated by radar data is inverted from the sequence of Z-I relation.

然后，用这组关系得到降雨的雷达估算值。

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