I suppose it could be a lesson in nightnavigation?
我想这或许可以是一次夜间的导航课程？
2
China's Antarctic exploration ship Snow Dragon arrived at the Great Wall Station in Antarctica Thursday after a month of day-and-nightnavigation.
经过一个月的昼夜航行，中国南极考察队12日乘"雪龙号"考察船抵达中国南极长城站。
3
In this paper, with the deck officers and pilots as the study subjects, a widespread research was carried out on the impact of "light pollution at sea" on nightnavigation.