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1.The philosopher's stone is a mythical concept in many cultures.
哲学家的石头是许多文化中的神话概念。
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2. The platypus, also known as the flat-headed duck, is a unique animal found in Australia.
鸭嘴兽，也被称为平头鸭，是一种独特的澳大利亚动物。
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3. Plato was a Greek philosopher who lived from 427 to 347 BCE.
柏拉图是一位古希腊哲学家，生活在公元前427年至公元前347年。