单词：signal-box
signal-box的用法和样例：
例句
- 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。
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