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https://www.almerick.com/2010/02/21/pono-%e8%a1%a1%e9%87%8f%e7%9c%9f%e7%90%86%e7%9a%84%e6%96%b9%e6%b3%95%e6%98%af%e7%9c%8b%e6%95%88%e7%94%a8/
PONO - 衡量真理的方法是看效用