signal
US /ˈsɪɡ.nəl/
UK /ˈsɪɡ.nəl/
1.
信号, 标志
a gesture, action, or sound that conveys information or an instruction
:
•
He gave a signal to the driver to stop.
他向司机发出停车信号。
•
The traffic light changed to a green signal.
交通灯变成了绿色信号。
2.
信号, 电波
an electrical impulse or radio wave transmitted or received
:
•
The phone has a weak signal here.
这里的手机信号很弱。
•
The radio signal was clear.
无线电信号很清晰。