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https://gitee.com/it-ebooks/industry-reports-2017-part2/raw/master/TalkingData-2017%E5%B9%B4%E4%B8%8A%E5%8D%8A%E5%B9%B4%E7%A7%BB%E5%8A%A8%E6%B8%B8%E6%88%8F%E5%B8%82%E5%9C%BA%E6%A6%82%E5%86%B5%E5%92%8C%E7%94%A8%E6%88%B7%E6%B4%9E%E5%AF%9F_1501204228013.pdf