| 单词 | radar fence | 
| 释义 | > as lemmasradar fence   radar fence  n. a line of radar stations for giving warning of intrusions into the air space behind it. ΘΚΠ the mind > attention and judgement > discovery > instrument for detection > 			[noun]		 > radar system > apparatus used in > group of radar fence1947 radar net1948 1947    Daily Courier 		(Connellsville, Pa.)	 8 Aug. 1/6 		(headline)	  				Eaker want radar fence built at Arctic Circle. 1957    R. Watson-Watt Three Steps to Victory Pl. facing p. 320 		(caption)	  				The 350 ft. steel lattice masts on ‘T’ site. Combined with ultra-short-wave-radiation these ensured that the outer edge of the radar fence could be set far enough from the British coasts. 1987    Science 17 July 257/1  				By instantaneously restructuring this capability on command, an invisible radar fence is erected around North America. < as lemmas | 
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