1. | 信号；暗号a movement or sound that you make to give sb information, instructions, a warning, etc. |
a danger/warning/distress, etc. signal 危险、警告、求救等信号 | |
At an agreed signal they left the room. 收到约定的信号后，他们离开了房间。 | |
The siren was a signal for everyone to leave the building. 警报器一响，就是要所有人离开大楼。 | |
When I give the signal , run! 我一发信号，你就跑！ | |
All I get is a busy signal when I dial his number(= his phone is being used) . 我什么时候拨他的电话听到的都是忙音。 | |
hand signals(= movements that cyclists and drivers make with their hands to tell other people that they are going to stop, turn, etc.) （骑车人和驾车人的）示意手势 |
2. | 标志；预示；信号an event, an action, a fact, etc. that shows that sth exists or is likely to happen |
The rise in inflation is a clear signal that the government's policies are not working. 通货膨胀率的上升清楚地表明，政府的政策不起作用。 | |
Chest pains can be a warning signal of heart problems. 胸部疼痛可能是心脏病的先兆。 | |
Reducing prison sentences would send the wrong signals to criminals. 减刑会向犯罪分子发出错误的信号。 |
3. | （尤指铁路和公路上的）指示灯，信号灯，红绿灯a piece of equipment that uses different coloured lights to tell drivers to go slower, stop, etc., used especially on railways/railroads and roads |
traffic signals 交通信号灯 | |
a stop signal 停车信号 |
4. | （传输声音、图像或其他信息的电波）信号a series of electrical waves that carry sounds, pictures or messages, for example to a radio, television or mobile/cell phone |
TV signals 电视信号 | |
a high-frequency signal 高频信号 | |
a radar signal 雷达信号 | |
to detect/pick up signals 探测到╱收到信号 | |
to emit a signal 发射信号 | |
I couldn't get a signal on my cell phone. 我的手机接收不到信号了。 |
1. | [i][t] 发信号；发暗号；示意to make a movement or sound to give sb a message, an order, etc. |
Don't fire until I signal. 等我发出信号后再开枪。 | |
Did you signal before you turned right? 右转弯前你示意了吗？ | |
He signalled to the waiter for the bill. 他示意服务员结账。 | |
He signalled to us to join him. 他示意要我们去他那儿。 | |
She signalled him to follow. 她示意他跟她走。 | |
The referee signalled a foul. 裁判鸣哨示意犯规。 | |
She signalled (that) it was time to leave. 她示意该走了。 | |
You must signal which way you are going to turn. 你要朝哪个方向转，必须发出信号。 |
2. | [t] ~ sth 标志；表明；预示to be a sign that sth exists or is likely to happen |
This announcement signalled a clear change of policy. 这个声明显示政策有明显的改变。 | |
The scandal surely signals the end of his political career. 毫无疑问，这桩丑闻预示他的政治生涯就此结束。 |
3. | [t] 表达；表示；显示to do sth to make your feelings or opinions known |
He signalled his discontent by refusing to vote. 他拒绝投票以示不满。 | |
She has signalled (that) she is willing to stand as a candidate. 她表示愿意作为候选人参加竞选。 |
