从技术角度来说电报线路难以维修。
On the technical side, telegraph lines are hard to maintain.
比如1859年的太阳风暴使得电报线路起火燃烧。
A solar storm in 1859, for example, caused telegraph lines to burst into flames.
一条电报线路或电话线路对另一条电报线路或电话线路的干扰。
Interference from one telegraph circuit to another telegraph circuit or into telephone circuits.
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