He raced to pick up the life jackets while his stepmother sent out a Mayday call.

他的继母发出无线电求救信号，他飞跑着去拿救生衣。

《柯林斯英汉双解大词典》

Apparently, no mayday call was issued.

显然，没有发出求救呼吁。

youdao

At 1:50 a.m., just 30 minutes after its first Mayday call, the Estonia vanished, sinking upside down into the sea.

在凌晨1：50，就在它第一次发生求救信号30分钟后，Estonia号消失了，翻了个身沉入大海。

youdao

which mean "help me." Frederick Stanley Mockford created the mayday call signal in the nineteen twenties.

VOA: special.2010.04.18

Instructor Steven Lewis, 38, made a mayday call 20 minutes into the training flight from Blackpool Airport.

BBC: Mystery over Lancashire crash helicopter's mayday call

The Christos sent a Mayday call that was picked up by Brixham coastguards who have been co-ordinating the rescue.

BBC: Boat sinks after stricken tug crew rescued off Devon coast

Investigators have been unable to establish why a mayday call was made from a helicopter before it crashed in Lancashire, killing two people.

BBC: Mystery over Lancashire crash helicopter's mayday call