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https://xdrink.org/2016/09/03/%e6%b5%81%e6%84%9f%e7%96%ab%e8%8b%97%e7%9a%84%e6%8a%95%e8%b3%87%e5%a0%b1%e9%85%ac%e7%8e%87/
流感疫苗的投資報酬率 @vaccine