?四路多工电报机
... quadruplex system ==> 四工电路系统,四路多工电报系统,四路多工制 quadruplex telegraph ==> 四路多工电报机 quadruplex telegraph system ==> 四路传输电报制 ...
?四工电报
... quadruplex system 四工系统... quadruplex telegraph 四工电报... quadrupole amplifier 四极放大器...
四路传输电报制
减流式四工电报
In 1874, Edison invented the quadruplex telegraph, which allowed the transmission of two signals in each direction down one wire.
FORBES: How You Can Profit From Thomas Edison's Inventions
Now, what sets the quadruplex telegraph apart is not the invention itself but how Edison put to use the harvest that he reaped from its sale.
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。