N-COUNT
(飛機(jī)或船只遇險(xiǎn)時(shí)發(fā)出的)無(wú)線電呼救信號(hào)
If someone in a plane or ship sends out a Mayday or a Mayday message, they send out a radio message calling for help because they are in serious difficulty.
例句
He raced to pick up the lifejackets while his stepmother sent out a Mayday call.
他的繼母發(fā)出無(wú)線電求救信號(hào)的時(shí)候，他飛跑著去拿救生衣。