单词	automatic direction finder
释义	automatic direction finder noun : a navigational tool that continuously displays the bearing of a designated reference radio beacon But unlike some other relics, the ADF (automatic direction-finder) keeps rearing its ugly head like an uninvited relative who shows up at the family picnic. Instrument pilots who try to fly without a good foundation in ADF needlework can quickly run smack into an indigestible hash of headings and bearings. Thomas H. Block, Plane & Pilot, January 1994 —abbreviation ADF Word History First Known Use 1938, in the meaning defined above
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