telegraph signal

 
  • 电报信号

telegraph signal的用法和样例:

例句

  1. 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。

telegraph signal的相关资料:

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