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IELTS BNC: 1960 COCA: 2078
signal

noun¹

 1sign/action/sound that sends a message標誌；動作；聲音ADJECTIVE | VERB + SIGNAL | SIGNAL + VERB | PREPOSITION ADJECTIVE➤clear, unmistakable清晰的／明確無誤的信號▸➤agreed, prearranged約好的／事先約定的信號▸➤conflicting, confusing, contradictory, mixed相互衝突的信號；讓人迷惑不解的信號；有歧義的信號▸➤wrong錯誤信號◇Laughing when you should be crying sends out the wrong signals to people.應該哭的時候卻笑，就向人們傳達了錯誤的信號。➤alarm, danger, distress, warning報警／危險／求救／警告信號▸➤hand, non-verbal, smoke, visual手勢；非語言信號；煙霧信號；視覺信號▸➤turn (NAmE) （汽車上的）轉向指示燈▸➤busy (NAmE) (engaged tone in BrE) （電話佔線時的）忙音◇All I get is a busy signal when I dial his number.我給他撥電話只能聽到佔線的忙音信號。➤buy, sell (both business商業) 買入／賣出信號◇A strong buy signal was issued to traders.交易員收到了強烈的買入信號。VERB + SIGNAL➤give (sb), make, send, send out（給某人）發信號；打信號◇When I give the signal, run!我一發信號，你就跑！➤interpret, read解讀信號◇The brain interprets the signals from the retina as light.大腦把來自視網膜的信號解讀為光。➤interpret sth as把⋯理解為信號◇The remark was interpreted as a signal that their government was ready to return to the peace talks.該言論被視作政府準備重回和平談判的信號。➤pick up, respond to領會信號；對信號作出反應◇Interviewers quickly learn to pick up non-verbal signals.採訪者很快學會讀懂非語言信號。➤act as作為信號◇The insect's yellow spots act as a warning signal to its predators.昆蟲身上的黃點是向其天敵發出的警告信號。SIGNAL + VERB➤come from sth信號來自⋯◇Try to read the signals coming from the patient.要盡量讀懂病人發出的信號。➤indicate sth信號表示⋯◇the signals that can indicate danger可能預示危險的信號PREPOSITION➤at a signal, on a signal按照信號◇At a prearranged signal, everyone started cheering.看到預先約好的信號，大家都開始歡呼起來。➤signal for示意⋯的信號◇She made a signal for the car to stop.她打了個手勢，讓汽車停下了。➤signal from, signal to來自⋯的／給⋯的信號◇Wait for the signal from the leader of your group.等你們組的組長發出信號。
signal

noun²

 2set of lights for drivers交通信號燈ADJECTIVE | VERB + SIGNAL | SIGNAL + VERB | SIGNAL + NOUN ADJECTIVE➤railroad, railway, traffic鐵路信號燈；交通信號燈VERB + SIGNAL➤operate操作信號燈SIGNAL + VERB➤be on red/green, be red/green紅燈亮；綠燈亮◇The traffic signals were on red.交通信號亮着紅燈。➤fail信號燈失靈SIGNAL + NOUN➤box (BrE) （鐵路上的）信號樓▸➤failure (BrE) 信號燈故障
signal

noun³

 3series of radio waves, chemical messages, etc.無線電波；化學信息ADJECTIVE | VERB + SIGNAL | SIGNAL + VERB | SIGNAL + NOUN | PREPOSITION ADJECTIVE➤faint, weak微弱的信號▸➤strong強信號▸➤high-frequency, low-frequency高頻／低頻信號➤input, output輸入／輸出信號▸➤acoustic, analogue/analog, audio, chemical, digital, electrical, electronic, GPS, light, radar, radio, satellite, sonar, sound, television, TV, video, wireless聲學信號；模擬信號；音頻信號；化學信號；數字信號；電信號；電子信號；全球定位系統信號；光信號；雷達信號；無線電信號；衞星信號；聲納信號；音頻信號；電視信號；視頻信號；無線信號VERB + SIGNAL➤carry, pass, relay傳送／傳遞／中繼轉發信號◇The nerves carry these signals to the brain.神經把這些信號傳給大腦。➤amplify, boost放大／增強信號▸➤convert (sth into), scramble（把⋯）轉換成信號；對信號作擾碼處理◇The signal is scrambled into code before it is sent.發送信號之前要先擾碼，把它變成密碼。➤decode, encode解碼信號；把信號編碼▸➤emit, generate, produce, send, transmit發射信號；發出信號；發送信號▸➤detect, pick up, receive, respond to探測信號；接收信號；對信號作出回應◇This equipment can detect very low-frequency signals.這種設備能夠探測甚低頻信號。➤block, jam攔截／干擾信號◇It is possible to jam GPS signals in battle.在作戰時對全球定位系統的信號進行干擾是可能的。SIGNAL + VERB➤travel信號傳播◇The digital signal travels down wires to the server.數字信號沿着線路傳到服務器。◇A light signal can travel well over 16 km before it halves in intensity.光信號傳播 16 公里以上強度才會減半。➤fade信號漸弱SIGNAL + NOUN➤intensity, strength信號強度PREPOSITION➤signal from來自⋯的信號◇a faint signal from the satellite衞星發出的微弱信號➤signal to向⋯發出的信號
signal

verb¹

 1move your arms to give a signal打手勢ADVERB | PREPOSITION ADVERB➤frantically瘋狂打手勢◇I saw her signal frantically to us.我看見她瘋了似的朝我們打手勢。PREPOSITION➤for示意⋯◇He raised his hand to signal for the waiter.他舉起手向侍者示意。➤to向⋯打手勢◇She tried to signal to the bus driver to stop.她試圖打手勢讓公共汽車司機停車。
signal

verb²

 2show/mark sth表明ADVERB | VERB + SIGNAL ADVERB➤clearly清楚地標誌◇These changes clearly signal the end of the welfare state as we know it.這些變化清楚地標誌着我們熟悉的福利國家的終結。➤effectively (especially BrE) 實際上表明◇A change of mind effectively signals a change in overall policy.改變主意實際上意味着整個政策有所改變。➤not necessarily不一定預示◇A fall in demand does not necessarily signal the death of the industry.需求的減少並不一定意味着該行業走向窮途末路。VERB + SIGNAL➤appear to, seem to似乎／好像預示◇These events appeared to signal the end of an era.這些事件似乎預示着一個時代的結束。➤try to試圖表明➤be intended to, be meant to旨在／意欲表明◇This address was meant to signal a change in policy.這個講話意欲表明政策將有所改變。

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