telegraph signal

 
  • 電報信號

telegraph signal的用法和樣例:

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.
    他發明的這種裝置,用於在無人看管的兩站之間傳輸電報信號,在此項發明前,愛迪生就已經是位電報專家了。

telegraph signal的相關資料:

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