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In the 1880s, a German physicist named Heinrich Hertz discovered radio waves, a type of invisible electromagnetic radiation.
19世纪80年代，德国物理学家海因里希·赫兹发现了无线电波，它是一种看不见的电磁辐射。
Hertz proved that the waves could travel through the air, just like light, and transmit information.
赫兹证明了无线电波可以像光一样在空气中传播，并传递信息。
Italian inventor Guglielmo Marconi created the first device that used radio transmissions in the 1890s.
意大利发明家伽利尔摩·马可尼在19世纪90年代发明了第一台无线电通讯设备。
It was a telegraph that could transmit Morse code without wires.
那是一种不用电线就能传送莫尔斯电码的电报机。
In the years before World War I, inventors developed radio devices that could communicate more complex messages, including spoken words and music.
在第一次世界大战爆发的前几年，发明家发明了无线电设备，可以传达更复杂的信息，比如语音和音乐。
Radios were originally used for military communication.
无线电收发报机最初是用于军事通讯的。
However, many people began to buy radios for personal use during the 1920s, when radio companies built stations for news and entertainment broadcasts.
然而，在20世纪20年代，当广播公司建立了新闻和娱乐广播电台时，许多人开始购买收音机供个人使用。
This allowed people to receive information about politics, the world, and important events almost instantly.
有了收音机，人们几乎能立即收到有关政治、世界和重要事件的信息。
