signal

• 过时或文学用语中的形容词，意为杰出的、惊人的或值得注意的。

An archaic or literary adjective meaning remarkable, striking, or notable.

1. Notable or remarkableC1formal

   Standing out from the ordinary; striking or conspicuous.

   显著的

   • The project was a signal success for the team.
   • Her signal contribution to the field was widely recognized.
   • The event was a signal failure in terms of organization.

   同义词conspicuousexceptionalextraordinarymemorablenotableoutstandingprominentremarkablesignificantstriking

   反义词commoninconspicuousordinaryunremarkable

• 名词，指传递信息、指令或警告的标志、手势或传输的脉冲。

A noun referring to a sign, gesture, or transmitted impulse that conveys information, instructions, or a warning.

1. Sign or indicationA2formal

   A gesture, sound, or action that conveys information or instructions.

   信号

   • The referee gave a signal to start the game.
   • She raised her hand as a signal for help.
   • The smoke was a signal that something was burning.

   同义词cuegesturehintindicationmarkeromensignsymptomtokenwarning

2. Electronic transmissionB1formal

   An electrical or electromagnetic impulse that carries data, such as radio, TV, or internet signals.

   信号

   • The radio signal is weak in this area.
   • My phone lost the signal during the storm.
   • The satellite sends a signal to the receiver on Earth.

   同义词broadcastemissionimpulsetransmissionwave

3. Traffic or warning deviceA2formal

   A device that uses lights, sounds, or movements to warn or direct people, such as traffic lights or railway signals.

   信号

   • The traffic signal turned red, so we stopped.
   • The train driver obeyed the signal at the crossing.
   • The warning signal flashed before the explosion.

   同义词alarmbeaconindicatorlightsemaphoretraffic lightwarning light

• 动词，指通过手势、动作或声音来传递信息或指令。

A verb used to indicate the act of conveying information or instructions by means of a gesture, action, or sound.

1. Communicate non-verballyB1formal

   To convey information or instructions through gestures, signs, or other non-verbal means.

   示意

   • The police officer signaled the driver to stop.
   • She signaled her friend to come over by waving her hand.
   • He signaled that the coast was clear with a thumbs up.

   同义词beckoncueflaggesticulategestureindicatemotionnodsignwave

2. Indicate or showB2formal

   To be a sign or indication of something, often a future event or change.

   表明，预示

   • The economic data signals a potential recession.
   • His resignation signaled the end of an era for the company.
   • The dark clouds signaled an approaching storm.

   同义词announcebetokendenoteforeshadowforetellheraldindicateportendpresagesignify

   反义词concealhidemasksuppress

3. Transmit a signalB2formaltechnical

   To send a signal, especially using electronic or radio waves.

   发送信号

   • The satellite signals data back to Earth.
   • The radio tower signals warnings to ships at sea.
   • The device signals when the battery is low.

   同义词beambroadcastemitradiaterelaysendtransmit