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可数名词
n.[C] 信号；暗号
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a sign which tells somebody to do something
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A red light is usually a signal of danger.
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红灯通常是危险的信号。
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The signal given, the bus started.
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信号灯一亮，汽车开始起动。
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Traffic signals are red, yellow and green lights which tell drivers when to stop and when to go.
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交通信号是红灯、黄灯和绿灯，它们告诉驾驶员什么时候停车，什么时候开车。
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signal book
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旗语通信手册
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signal box
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（铁路上的）信号所；信号塔
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signal code
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通信密码
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signal fire
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烟火信号
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signal flag
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手旗；信号旗
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signal generator
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信号发生器
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signal gun
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信号枪；号炮
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signal lamp
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信号灯
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signal man
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信号员；通信兵
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signal plate
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信号板
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signal rocket
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烟火信号弹
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signal station
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信号站
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动词
v. 给信号；用手势等表示
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tell people something by moving your hand, a flag, etc. or by putting on a light
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The policeman signalled the children to cross the road.
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警察向孩子们做手势，叫他们过马路。
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He signalled the car to stop by raising his hand.
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他举手示意车停住。
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He signalled the advance.
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他以信号告知前进。
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