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BNC: 33660 COCA: 29851

a special radio signal sent from a ship or an aircraft when it needs help(船只、飞机发出的)无线电求救信号

BNC: 33660 COCA: 29851
BNC: 33660 COCA: 29851
BNC: 33660 COCA: 29851
mayday
Relating to operating aircraft: aerobatics, aerospace, airborne...

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