遇难炮
... distress frequency 遇险呼救频率 distress gun 遇难炮 distress gun 遇难信号枪 ...
遇难信号枪
... 遇难自动灯光:distress light 遇难信号枪:distress gun 遇难信号火箭:life rocket ...
遇难求救信号枪
... 遇难求救旗 distress flag 遇难求救信号枪 distress gun 遇难求救灯号 distress light ...
船长就下令放一枪,作为求救的信号。