To date, 58 U.S. nuclear submarines have been equipped with Sperry Marine VMS-based navigation systems, and 92 percent of them have been certified to use ECDIS-N as the primary navigation plot.
迄今为止，美国的58艘核潜艇都已配备了斯佩里海事VMS导航系统，其中92％已经获得认证，使用ECDIS-N作为主要的导航图。
These fossil date indicate that Ningbo Formation is marine-continental transitional sediment, maybe belonging to tidal zone.
这些化石资料表明，宁波组属于一套海陆过渡型沉积，可能为潮间带。
For instance, sea lilies, marine animals with feathery arms, date back more than 400 million years.
举例来说，有羽状触手的海洋动物海百合，就可追溯到4亿多年前。
To date, 58 U. S. nuclear submarines have been equipped with Sperry Marine VMS-based navigation systems, and 92 percent of them have been certified to use ECDIS-N as the primary navigation plot.
迄今为止，美国的58艘核潜艇都已配备了斯佩里海事vms导航系统，其中92%已经获得认证，使用ECDIS - N作为主要的导航图。
To date, 58 U. S. nuclear submarines have been equipped with Sperry Marine VMS-based navigation systems, and 92 percent of them have been certified to use ECDIS-N as the primary navigation plot.
迄今为止，美国的58艘核潜艇都已配备了斯佩里海事vms导航系统，其中92%已经获得认证，使用ECDIS - N作为主要的导航图。
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