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”.
“当我看到一只鸟像鸭子一样走路，像鸭子一样游泳，像鸭子一样嘎嘎叫，我就把这只鸟叫作鸭子。”此话据说出自美国作家和诗人詹姆斯•惠特科姆•赖利(James Whitcomb Riley)。
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