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中外学者确认最早半水生记录：1.25 亿年前哺乳动物就会游泳 SECONDARY_TEXT

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此次发现的板尾董尖齿兽标本罕见保存了门齿、犬齿、前臼齿、臼齿在不同世代的替换齿，是迄今发现的首个在哺乳动物四类牙齿中均可发生多次替换的哺乳动物。	verbatim — the passage is on the page, character for character