这艘船发出无线电求救信号。
他的继母发出无线电求救信号，他飞跑着去拿救生衣。
He raced to pick up the life jackets while his stepmother sent out a Mayday call.
我们曾收到那架飞机失事前发出的无线电求救信号。
We had picked up radio signals for help from the plan before it crashed.
那艘船用无线电发出求救信号。
轮船上的无线电发出求救信号。
轮船上的无线电发出求救信号。
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