usually refers to hatches
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。
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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.
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usually refers to hatches
通常指舱口
以上为机器翻译结果，长、整句建议使用 人工翻译 。