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...
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