U-boater
Alternative form of catnap (“short amount of time spent sleeping”)
(medicine) At night.
A submariner on a U-boat
(obsolete, inorganic chemistry) chloride
そのUボートの乗組員は、暗い大西洋の夜にソナーのピング音が大きくなるとハッチをしっかり締めた。
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