| 单词 | periscope depth |
| 释义 | > as lemmasperiscope depth periscope depth n. the depth at which a submarine's periscope will just break the surface of the water. ΘΚΠ society > armed hostility > hostilities at sea > naval weapons and equipment > [noun] > periscope > depth of periscope depth1926 periscope level1963 1926 Times 1 Nov. 14/1 Submarines of the ‘H’ and ‘R’ classes were seen diving to periscope depth and returning to the surface. 1992 Ships Monthly Apr. 14/1 Underwater she can move at over twenty knots with a snorting speed at periscope depth of nineteen knots. < as lemmas |
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