| 单词 | purple zone | 
| 释义 | > as lemmaspurple zone   purple zone  n. = purple airway n. ΘΚΠ society > travel > air or space travel > specific movements or positions of aircraft > air as medium for operation of aircraft > 			[noun]		 > route through the air > types of shuttle route1942 purple airway1955 purple zone1970 1970    Daily Tel. 1 Aug. 1/2  				‘A purple zone’ was not in operation..because the Prince was flying only in the immediate area of Tangmere. 2004    Daily Record 		(Glasgow)	 		(Nexis)	 12 Nov. 4  				All royal flights plot an exact route and other aircraft are warned to stay clear of the area, known as a ‘purple zone’. < as lemmas | 
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