SOS
n[sing]
(a) urgent message for help (sent by radio, etc, usu in code) from a ship, an aircraft, etc when in danger 紧急求救信号(船只、 飞机等发出的, 通常为无线电代码)
send an SOS to the coastguard 向海岸警卫队发出求救信号
[attrib 作定语]
an SOS message 紧急求救信号.
(b) urgent appeal for help or response (eg a radio broadcast to find relatives of a seriously ill person) 紧急求助或寻人呼叫(如为重病人寻找亲属的无线电广播)
We heard the SOS about Bill´s father on the car radio. 我们从汽车收音机里听到了有关比尔父亲的紧急寻人广播.
(joc 谑) Our daughter sent us an SOS for some more money. 我们的女儿给我们发来了再要点钱的求救信号. Cf 参看 mayday.