radiotelegrapm是什么意思

n.无线电报

1. The invention of radiotelegraphy revolutionized long-distance communication.
无线电报的发明彻底改变了长距离通信的方式。

2. Radiotelegraphy was widely used during the early 20th century for maritime communication.
20世纪初，无线电报在海上通信中广泛使用。

无线电报