A gesture or sound made to communicate information or instructions.
The coach gave a signal for the team to start the play.
教練發出了一個信號,讓團隊開始比賽。
A device using lights to control traffic, especially on roads and railways.
The train came to a halt due to a signal failure.
由於信號故障,火車停了下來。
An electromagnetic wave that conveys sounds, images, or messages to a receiver.
The radio picked up a weak signal from the distant station.
收音機從遠處的電台接收到了一個微弱的信號。
An indication or hint that suggests the existence or likelihood of something.
The smoke was a signal that there was a fire nearby.
煙霧是一個信號,表明附近有火災。
To communicate information or instructions using a gesture or sound.
The guard signaled to us that the gate was open.
警衛向我們示意大門是開著的。
To indicate a change in direction of a vehicle by using lights or hand signals.
You must signal before you change lanes on the highway.
在高速公路上變道前必須打信號。
To be a sign or indication of something.
The decline in sales signals a problem with the product.
銷售額下降表明產品存在問題。
To express one's feelings or intentions in a subtle way.
She signaled her approval by nodding her head.
她通過點頭示意表示同意。
Having a significant meaning or impact.
The election results were a signal victory for the party.
選舉結果對黨來說是一個明顯的勝利。