usually refers to hatches的意思|示意

封舱 To close or to make watertight; usually refers to hatches 封舱，封闭舱室已达 到水密性，通常是指关闭水密门。

封闭舱室已达到水密性 Batten down To close or to make watertight; usually refers to hatches 封舱，封闭舱室已达到水密性，通常是指关闭水密门。 Battle lights Red lights used to prevent showing any light for any distance.