| 单词 | ack-ack | 
| 释义 | ack-ack(ˈækˌæk) noun military 1.  a.  anti-aircraft fire  b.  (as modifier)  ack-ack guns 2.  anti-aircraft arms  Word origin C20: British army World War I phonetic alphabet for AA, abbreviation of anti-aircraft | 
	
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