from or referring to the period of time between around 208 and 146 million years ago, in which the first birds appeared and the single piece of land broke up into separate continents侏罗纪的(2.08亿年前至1.46亿年前之间的地质年代。该时期出现了最早的鸟类,一大片陆地断裂分割成了几个大陆。)
the Jurassic period侏罗纪
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