sig·nal

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【释义】：

n．❶ 信号，信号机：a green light signal 绿灯信号．give the signal for advance发出前进的信号．traffic signals交通信号．a signal gun信号枪，号炮．A red light is usuallya signal of danger．红灯一般是危险信号．❷ 动机，导火线．

－a．显著的，非常的：a signal victory(defeat)大胜(败)．signally ad．

－vi．发信号，打信号：Sailors signal with flags by day andwith lights at night．水手们白天用旗子发信号，夜间用灯光发信号．

－vt．用信号通知(消息)：signal a message用信号发送消息．sig·nal(l)er n．信号员，信号兵．