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在欧洲人发现澳大利亚前,没有人会对“天鹅都是白色的”产生疑问,直到在澳大利亚发现了黑天鹅,人们才改变了过去的习惯性认识,原来天鹅还有黑色的!
Until Europeans discovered Australia, no one doubted that “swans are white”. Until the black swans were discovered in Australia, people changed their habitual habits. The original swans were black!