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(以手勢、聲音、行動等發出的)信號，暗號
A signal is a gesture, sound, or action which is intended to give a particular message to the person who sees or hears it.
例句
They fired three distress signals...
他們發射了3次求救信號。
As soon as it was dark, Mrs Evans gave the signal...
天一黑，埃文斯夫人就發出了信號。
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VERB
(用手勢、聲音等)發信號，發暗號，示意
If you signal to someone, you make a gesture or sound in order to send them a particular message.
例句
The United manager was to be seen frantically signalling to McClair...
一會兒可以看到曼聯主教練拼命地朝麥克萊爾示意。
He stood up, signalling to the officer that he had finished with his client...
他站起身，向警察示意他和他的當事人已經談完了。
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跡象;信號;預示
If an event or action is a signal of something, it suggests that this thing exists or is going to happen.
例句
Kurdish leaders saw the visit as an important signal of support...
庫爾德領導人將這次訪問視作一種表示支持的重要信號。
The first warning signals came in March...
第一次警示出現在3月份。
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VERB
預示;表明;顯示
If someone or something signals an event, they suggest that the event is happening or likely to happen.
例句
She will be signalling massive changes in energy policy...
她將暗示能源政策會有重大變化。
Britain was signalling its readiness to have the embargo lifted...
英國表示愿意取消貿易禁令。
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(鐵路上的)指示燈，信號燈
A signal is a piece of equipment beside a railway, which indicates to train drivers whether they should stop the train or not.
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(傳輸信息的無線電、光波或電流)信號
A signal is a series of radio waves, light waves, or changes in electrical current which may carry information.
例句
...high-frequency radio signals.
高頻無線電信號
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ADJ
重大的;顯要的;非凡的
You use signal to describe a success or failure when you are emphasizing the fact that it has occurred and are indicating that the consequences are significant.
例句
His final round was a signal triumph in a career marked by many sweet moments.
最后一場比賽的勝利在他充滿欣喜的職業生涯中具有非凡的意義。
...John Major's signal failure to grab America's attention.
約翰·梅杰顯然沒有能夠引起美國的注意