名词
中文翻译：声频电报系统
同义词：
['voice frequency telegraph', 'voice frequency telegraphy']
例句：
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1. The voice-frequency telegraph system is used to transmit voice signals over long distances.
声频电报系统用于在长距离上传输语音信号。
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2. The voice-frequency telegraph system was developed in the early 20th century for military communications.
声频电报系统在20世纪初为军事通信而开发。
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3. Voice-frequency telegraph systems have revolutionized the way we communicate with each other.
声频电报系统已经彻底改变了我们彼此交流的方式。