... 古人类学家Palaeo-anthropologist 古生代the Palaeozoic Era 虢国墓the Guoguo tomb (at Shangfengling in Shaan County of Henan) ...
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My professor studies flora of the Palaeozoic Era.
我的教授研究古生代的植物群。
Like the Palaeozoic Era, the Mesozoic Era has been divided into smaller units of geological time called period.
如同古生代一样，中生代也可划分成一些叫纪的较小的时间单位。
The second major era of geological time which lasted from the end of the Palaeozoic era about 225 million years ago, to the start of the Tertiary, some 70 million years ago.
中生代是地质时期的第二个大时代，从大约2.25亿年前的古生代末延续到约7千亿年前的第三纪初。
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