like the remiped, one of the most ancient of all living crustaceans. 例如桨足虫——一种最古老的甲壳动物
These spires are the eroded remains of an ancient seabed that once stretched between the two continents. 曾经连接两块大陆的古老海床 侵蚀后留下了一座座尖耸的山峰