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- 没有视频信号。
There is no video signal.
- 灯塔每一分钟发出两次信号。
The lighthouse flashes signals twice a minute.
- 信号响时，人人脱帽致敬。
Everyone uncovered when the signal sounded.
- 警察向来往车辆打信号，示意缓慢前行。
The police signalled the traffic to move forward slowly.
- 红灯常常是危险的信号。
A red lamp is often a danger signal.
- 各种信号控制着铁路轨道的每个部分。
Signals control each section of the railway track.
- 我按报时信号校正我的表。
I corrected my watch by the time signal.
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