signal
noun [ C ] uk/ˈsɪɡ.nəl/ us/ˈsɪɡ.nəl/
(ACTION)
B2 信号
an action, movement, or sound that gives information, a message, a warning, or an order
When she gave (them) the signal, they all cheered. 她发出信号后，他们都欢呼起来。
[ + that ] The fireworks were a signal that the festival had started. 焰火是节日开始的信号。
[ + to infinitive ] The police officer gave us the signal to stop. 警察示意我们停下。
The signal for a race to start is often the firing of a gun. 赛跑常以发令枪响作为开始的信号。
US (UK indicator)（车辆）转向灯（同 turn signal）
a turn signal
- More examples
- At a prearranged signal, everyone started moving forwards.
- I usually set my watch by the time signal on the radio.
- At the given signal, the group rushed forward to the barrier.
- I've been trying to call him all evening, but I keep getting the engaged signal.
- A whistle is the signal for the children to line up ready to go into the classroom.
(WAVE)
B2 （用于传输声音、图像或其他信息的）电波信号
a series of electrical or radio waves that are sent to a radio or television in order to produce a sound, picture, or message
- More examples
- The picture quality is bad because the TV signal isn't powerful enough.
- The equipment sent out a regular high-pitched signal.
- There is some interference on the signal - do not adjust your set.
(SHOWING)
迹象
something that shows that something else exists or is likely to happen
The loss is a clear signal of his deteriorating confidence. 比赛输了，这清楚地表明他信心日渐不足。
The changing colour of the leaves on the trees is a signal that it will soon be autumn. 树叶颜色的改变表明秋天即将来临。
(EQUIPMENT)
（尤指铁路或公路上的）信号灯
equipment, especially on the side of a railway or road, often with lights, that tells drivers to stop, continue, or go more slowly
a railway signal 铁路信号灯
a traffic signal 交通信号灯
a road signal 道路信号灯
signal
verb uk/ˈsɪɡ.nəl/ us/ˈsɪɡ.nəl/ -ll- or -l-
(ACTION)
C2 [ I or T ]发信号;示意
to make a movement, sound, flash, etc. that gives information or tells people what to do
Flashing lights on a parked car usually signal a warning (to other drivers). 停着的车辆上闪烁的车灯通常是警告（其他驾车者）的信号。
He signalled left, and turned the lorry slowly. 他打开左转方向灯，然后将卡车缓慢转过去。
He was signalling (= giving a signal) with a red flag. 他正用红色旗子发信号。
She signalled for help. 她发出了求救信号。
[ + that ] She signalled to the cars behind her that they were going the wrong way. 她示意后面的车辆走错了路。
[ + obj + to infinitive ] The children's mother signalled them to be quiet. 孩子们的母亲示意他们安静。
[ + to infinitive ] The children's mother signalled to/for them to be quiet. 孩子们的母亲向他们示意保持安静。
- More examples
- She signalled to them to sit down.
- The ship signalled for help.
- A flashing light signalled that there was danger ahead.
- I signalled left and turned into the driveway.
(SHOW)
[ T ]表达，表示;显示
to show that you intend or are ready to do something
[ + that ] The union has signalled that the workers will strike. 工会表示工人们将会罢工。
The union has signalled the workers' intention to strike. 工会已表示工人们打算罢工。
The death of Chairman Mao signalled (= marked) the end of an era in Chinese history. 毛主席的去世标志着中国历史上一个时代的结束。
signal
adjective [ before noun ] formal uk/ˈsɪɡ.nəl/ us/ˈsɪɡ.nəl/
显著的；不寻常的
noticeable and unusual
a signal success/failure 重大胜利／失败