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。
In the Three phase and Four wire circuit system, the neutral wire is very important.
在三相四线制供电系统中，中性线是非常重要的。
In 1874 he invented and sold to Western Union a system by which four messages could be sent over one wire at the same time, two in each direction.
1874年他发明并售给西联电讯公司一种装置，用了它可以在一根电线上拍发四份电报，即从每一方向可同时拍发两份电报。
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