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。
Dinosaur, 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.
这是盘龙目爬行动物的一科。
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