信号响时，人人脱帽致敬。
Everyone uncovered when the signal sounded.
红灯常常是危险的信号。
A red lamp is often a danger signal.
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 singals twice a minute.
时钟信号输入端被设 计用于提供时钟信号。
A clock signal input is designed to supply a clock signal.
对随机信号和混沌信号的特性进行了分析比较。