| 释义 |
DEFINITIVE EXAMPLES 权威例句〔Ordovician〕Ordovician fish 奥陶纪的鱼类剑桥高阶〔Ordovician〕The Ordovician Period.奥陶纪美国传统〔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 |