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https://xdrink.org/2014/08/28/%e5%ba%95%e5%b1%a4%e9%9a%8e%e7%b4%9a%e5%ad%98%e5%9c%a8%e7%9a%84%e6%ad%a3%e9%9d%a2%e5%8a%9f%e8%83%bd/
底層階級存在的正面功能