“二叠纪”例句

单词 二叠纪
例句 DEFINITIVE EXAMPLES 权威例句〔Permian〕Permian rocks 二叠纪岩石剑桥高阶〔Permian〕The Permian Period.二叠纪美国传统〔eurypterid〕Any of various large, segmented aquatic arthropods of the order Eurypterida that existed from the Ordovician Period to the Permian Period.(古生)板足鲎目的:一种巨大的、有节的,属于板足鲎目的水生节肢动物,生存于奥陶纪到二叠纪时期美国传统〔therapsid〕Any of various reptiles of the order Therapsida of the Permian and Triassic periods, many of which are considered to be direct ancestors of mammals.兽孔类:二叠纪和三迭纪的兽孔类爬行动物中的一种,它们中的许多种被认为是哺乳动物的直接祖先美国传统

 

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