无线电报机; 无线电报术;
用无线电报发(信息等),(给…)发无线电报;
The full text is divided into five parts: the introduction is about the basic research and technical background before the appearance of radiotelegraph.
全文分为五部分:绪论部分简单介绍无线电报出现之前的基础研究及技术实践的背景。
Americans can communicate quickly with people in other countries by cable, radiotelegraph radiotelephone.
美国人可以利用海底电报、无线电报、用户电报及无线电话和他国人民通讯,迅速便捷。
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