单词	air surveillance
释义	air surveillance noun : the systematic scanning of a portion of the airspace especially by electronic or visual means to detect and track flying aircraft or missiles Word History First Known Use 1952, in the meaning defined above
随便看	garrison houses garrison prisoner garrison ration garrison state garrisoned Garrisonian garrisoning Garrisonism garrisonite garrisons garron garrons garrot garrote garroted garroter garroters garrotes garroting garrots garrotted garrotters garrottes garrotting garrottings

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