| 单词 | radar and television aid to navigation | 
| 释义 | radar and television aid to navigation [`rā´där ǝn `tel·ǝ´vizh·ǝn `ād tǝ ´nav·ǝ`gā·shǝn]  NAVIGATION Device which converts a circular scan radar presentation to a horizontally scanned television presentation; it provides a continuous bright display with target trails for course and speed indications of moving targets.  | 
	
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