telegraph signal
英
美
- 电报信号
双语例句
- He was already an expert on the telegraph before he came up with a gadget that sent telegraph signals between unmanned stations.
他发明的这种装置，用于在无人看管的两站之间传输电报信号，在此项发明前，爱迪生就已经是位电报专家了。
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