1N-COUNT (飛機或船只遇險時發出的)無線電呼救信號 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. (飛機或船只遇險時發出的)無線電呼救信號
He raced to pick up the lifejackets while his stepmother sent out a Mayday call.
他的繼母發出無線電求救信號的時候,他飛跑着去拿救生衣。
2CONVENTION (無線電求救信號中的求救内容)“求救!求救!” 'Mayday! Mayday!' is the phrase that is used in Mayday messages to indicate that help is needed. (無線電求救信號中的求救内容)“求救!求救!”