The American writer and poet James Whitcomb Riley is credited with the observation that “when I see a bird that walks like a duck and swims like a duck and quacks like a duck, I call that bird a duck”.
“當我看到一只鳥像鴨子一樣走路，像鴨子一樣游泳，像鴨子一樣嘎嘎叫，我就把這只鳥叫作鴨子。”此話據說出自美國作家和詩人詹姆斯?惠特科姆?賴利(James Whitcomb Riley)。
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