| 释义 |
noun | verb | adjective signalsignal1 /ˈsɪgnəl/ ●●● S3 W3 noun [countable] ETYMOLOGYsignal1Origin: 1300-1400 Old French signale, from Medieval Latin, from Late Latin signalis of a sign, from Latin signum; ➔ SIGN1 ► At the signal At the signal he turned off the lights. ► gave ... signal The general gave the signal for his troops to advance. ► warning signal A red warning signal flashed. ► a clear signal The move was a clear signal of support for his policies. ► mixed signals Our society sure gives kids mixed signals about sexuality. ► strong signal It was a strong signal that he should look for another job. ► send/give a signal This will send the wrong signal to potential investors. ► send (out)/transmit/emit a signal the equipment needed to transmit digital signals ► receive/pick up a signal The coast guard picked up a distress signal from a freighter. THESAURUSshows something is true► sign an event, fact, etc. that shows that something is happening or will happen, or that something is true or exists: There were signs of a struggle – several chairs were knocked over. Police found no sign of forced entry. ► indication indication means the same as sign but sounds more formal: He gave no indication that he saw me. ► indicator a sign that people look for and can recognize which tells them what is happening or is true: New home sales are used as an indicator of how well the economy is doing. ► evidence facts or signs that show clearly that something exists or is true: The warm breeze is evidence that spring is on its way. ► signal a sign that tells someone to take action or warns someone about something: My mother called me by my full name, always a signal that she was angry. ► symptom a sign that an illness or problem exists: Seizures are a common symptom of the disease. Rising unemployment rates are a symptom of the bad economy. ► mark a sign, especially that you respect or honor someone: People stood in silence as a mark of respect. ► trace a very small sign that a particular situation exists or is true: There was not a trace of sadness in his voice. 1a sound or action that you make in order to give information to someone or tell him or her to do something: At the signal he turned off the lights.signal (for somebody) to do something The general gave the signal for his troops to advance.► see thesaurus at sign1 → see also busy signal, smoke signal2an event or action that shows what someone feels, what exists, or what is likely to happen: signal (that) The figures are a signal that the economy is improving. A red warning signal flashed. The move was a clear signal of support for his policies. Our society sure gives kids mixed signals about sexuality. It was a strong signal that he should look for another job.send/give a signal This will send the wrong signal to potential investors.3a series of light waves, sound waves, etc. that carry an image, sound, or message, for example in radio or television: The telephone changes sound waves into electrical signals.send (out)/transmit/emit a signal the equipment needed to transmit digital signalsreceive/pick up a signal The coast guard picked up a distress signal from a freighter.4a piece of equipment with colored lights, used on a road or railroad to tell drivers when they can continue or when they must stop: We waited for the signal to turn green. noun | verb | adjective signalsignal2 ●●○ verb VERB TABLEsignal |
| Present | I, you, we, they | signal | | he, she, it | signals | | Past | I, you, he, she, it, we, they | signaled | | Present perfect | I, you, we, they | have signaled | | he, she, it | has signaled | | Past perfect | I, you, he, she, it, we, they | had signaled | | Future | I, you, he, she, it, we, they | will signal | | Future perfect | I, you, he, she, it, we, they | will have signaled |
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| Present | I | am signaling | | he, she, it | is signaling | | you, we, they | are signaling | | Past | I, he, she, it | was signaling | | you, we, they | were signaling | | Present perfect | I, you, we, they | have been signaling | | he, she, it | has been signaling | | Past perfect | I, you, he, she, it, we, they | had been signaling | | Future | I, you, he, she, it, we, they | will be signaling | | Future perfect | I, you, he, she, it, we, they | will have been signaling |
noun | verb | adjective signalsignal3 adjective formal ETYMOLOGYsignal3Origin: 1600-1700 French signalé, past participle of signaler to show a difference between, from Old Italian segnalare, from Medieval Latin signale; ➔ SIGNAL1 a signal achievement/success/failure etc. a very important achievement, success, etc. |