a building from which signals are sent to control the movements of railway trains
双语例句
用作名词 (n.)
The term propagation-delay refers to the average time it takes the input signal to propagate to the output. 传导延时这一概念就是指从输人信号到输出信号所经历的平均时间。
The amount of energy needed to send a signal is so astoundingly small that electricity had to be reimagined as something altogether different from power. 因为，发送一个信号所需的能量小得令人不敢相信，以至于电必须被想象成某种完全不同于能量的东西。
