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https://sourceforge.net/p/industry-reports-2018-part1/code/ci/master/tree/TalkingData-2017%E5%B9%B4%E7%A7%BB%E5%8A%A8%E4%BA%92%E8%81%94%E7%BD%91%E8%A1%8C%E4%B8%9A%E5%8F%91%E5%B1%95%E6%8A%A5%E5%91%8A_1520215265519.pdf?format=raw