In the summer of 1918 the express, telephone, and telegraph business of the entire country passed under government control.
1918 年夏天,全国的快递、电话和电报业务都交由政府控制。
TED-Ed(视频版)
But since then, we've only become more dependent on electrical systems. In 1921, another powerful solar storm caused telephones and telegraph equipment around the globe to combust.