Another improvement, by the famed inventor Thomas Alva Edison (1847-1931) in 1874, was the Quadruplex system, which allowed for four messages to be transmitted simultaneously using the same wire.

另一项技术进步——四路系统，由著名发明家托马斯·阿尔瓦·爱迪生(Thomas Alva Edison, 1847 - 1931)于1874年发明，它可以使四条信息在同一条电报线上同时传送。

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Among others, he experimented with the idea of telegraphy - sending messages over a wire by electricity.

他对电报进行了实验——通过电线来传播信息。

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Telegraphy in which messages are transmitted by radio instead of wire.

用无线电发送电报信息（通常使用莫尔斯电码）。

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Among others,he experimented with the idea of telegraphy C sending messages over a wire by electricity.

VOA: special.2009.02.22

Among others,he experimented with the idea of telegraphy - sending messages over a wire by electricity.

VOA: special.2010.10.24