单词 | df |
释义 | > as lemmasD.F. D.F. n. direction(al) finding. ΘΠ the world > space > direction > [noun] > finding direction > device for finding direction orientator1844 locator1904 direction-finder1913 D.F.1920 1920 Year Bk. Wireless Telegr. 946 If the ship is equipped with D.F. apparatus every wireless station becomes a beacon on which a bearing can be taken. 1940 C. Gardner A.A.S.F. 66 They'd managed to get Fécamp radio station shut down, so that German aircraft could no longer take D.F. bearings from it. < as lemmas |
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