Marconi commutator

例句：

1. 1. The Marconi commutator was the first electronic device to transmit voice signals over long distances.
   马可尼交流器是第一个用于远距离传输语音信号的电子装置。
2. 2. The Marconi commutator was used in radio transmissions during World War II.
   在第二次世界大战期间，马可尼交流器被用于无线电传输。
3. 3. The Marconi commutator is still used today for various applications in electronics and communications.
   马可尼交流器至今仍用于各种电子设备和通信领域的应用。