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词汇 ack-ack
释义

ack-ack

noun
/ˌæk ˈæk/
/ˌæk ˈæk/
[uncountable] (informal)
  1. the repeated firing of guns at aircraft高射炮火
    词源signallers' name for the letters AA; ack for A was replaced in military use by able in 1942.
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