Any of various extinct,often gigantic,carnivorous or herbivorous reptiles of the orders Saurischia and Ornithischia that were chiefly terrestrial and existed during the Mesozoic era.

 
  • 恐龙一种主要生活在中生代时期的陆栖动物,是庞大的食肉或食草爬行类动物,属龙盘目与鸟盘目,已绝种。
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