| 单词 | 二迭纪 |
| 释义 | 〔thecodont〕Any of various extinct primitive archosaurs of the order Thecodontia of the late Permian and Triassic periods, having teeth in sockets and probably ancestral to the dinosaurs.槽齿类：二迭纪和三迭纪晚期槽齿目几种已灭绝的原始初龙，牙槽中有牙齿并且可能是恐龙的祖先〔cotylosaur〕Any of an extinct order (Cotylosauria) of massive primitive reptiles of the Carboniferous and Permian periods that included the ancestors of all of the reptiles. Also called root reptile Also called stem reptile 杯龙类：任何大的原始爬虫类（杯龙类）的已灭绝种类之一，属于包含所有爬虫类的祖先的石炭纪和二迭纪时代 也作 root reptile 也作 stem reptile |
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