n.信号；标志
v.(发信号)通知、表示
adj.显著的
A red lamp is often a danger signal. 红灯常常是危险的信号。
I corrected my watch by the time signal. 我按报时信号校正我的表。
I've called several times, but I keep getting a busy signal. 我打了好几次了,可是一直是忙音。
We live too far from the city to get a strong television signal. 我们住的地方离城里太远, 不能收到清晰的电视图像。
Her speech yesterday is a signal that her view has changed. 她昨天的讲话标志著她的观点已经转变。
用作动词 (v.)The police signalled the traffic to move forward slowly. 警察向来往车辆打信号，示意缓慢前行。
The submarine signaled for help. 潜水艇发出求救的信号。
用作形容词 (adj.)People speak of Mark Twain as a signal humourous writer. 人们称马克·吐温为杰出的幽默作家。
This is a signal success. 这是显著的成功。
signal用作及物动词时,可接名词、代词或that/wh从句作宾语。signal还可接双宾语,常以带或不带疑问词的动词不定式作直接宾语,其间接宾语可以由介词to引出, to可以省略。不用于被动结构。
signal还可用作形容词,意思是“明显的,(非常)显著的,非凡的”。例如:This is a signal failure.这是明显的失败。People speak of Mark Twain as a signal humorous writer.人们称马克·吐温为杰出的幽默作家。
