the depth at which a submarine's periscope will just break the surface of the water.
单词 | θ165207 |
释义 | society > armed hostility > hostilities at sea > naval weapons and equipment > [noun] > periscope > depth of (2) periscope depth1926 the depth at which a submarine's periscope will just break the surface of the water. periscope level1963 = periscope depth n. |
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