音頻[響] 信號 an audible signal; 臂板信號 [鐵道] semaphore; 燈光信號 light signal; 識別信號 identification signal; 遇難信號 [航海學] distress signal; sos; 雜亂信號 [無線電] hash; 火車切不可越過危險信號。 a train must not pass a signal that is at danger. 信號是用旗或燈發出的。 signals are made with flags or lamps.; 信號彈 [工業] signal flare; 信號燈 signal lamp [light]; alarm lamp; light; signallight; winker; call lamp; blinker; telltale lamp; 信號發生器 signal generator; generator; producer; 信號槍 signal gun; signal piping; flare gun; flare pistol; pyrotechnic pistol; ground signal projector