A Mayday signal will be sent out when a ship or aircraft encounters immediate and serious distress.

当船只或飞机遇到紧急的严重困难时，将发出求救信号。

The tower received a Mayday signal from an aircraft this morning.

塔台于今日上午接收到了一架飞机发出的遇难求救信号。

The signal receiving center recently received Mayday signals from multiple ships.

信号接收中心近日接收到多起船舶的遇难求救信号。

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。

Mayday! Mayday! Bee going down!

救命！救命！蜜蜂要掉下去了！

Apparently, no mayday call was issued.

显然，没有发出求救呼吁。

I hope you have a grand time on MayDay.

我希望你在救难信号上有壮观的时间。

I'm going to a Mayday concert tomorrow!

我明天要去五月天的演唱会！