radio-copying telegraph

例句：

1. 1. The invention of the radiotelegraph revolutionized communication across long distances.
   无线电报的发明革命化了跨长距离的通信。
2. 2. In the early days of radiotelegraphy, messages were sent by radio waves traveling through the air.
   在无线电报的早期，通过无线电波穿越空气发送信息。
3. 3.The radiotelegraph was a marvel of technology that allowed people to communicate across great distances without the need for physical contact.
   无线电报是一种令人惊叹的技术，它允许人们无需物理接触就跨越巨大的距离进行交流。