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mayday
noun [singular] /ˈmeɪdeɪ/
  1. a radio signal which people on a ship or plane use to call for help when they are in danger (轮船或飞机遇险时用的)无线电呼救信号

    a mayday call 遇险无线电呼救信号

     Synonyms and related words
    Relating to operating aircraft: aerobatics, aerospace, airborne...

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