voice carrier

例句：

1. 1. The voice of the speaker was carried through the room by the acoustic waves.
   说话者的声波通过声波传播到房间中。
2. 2. The microphone is a device that converts sound waves into electrical signals.
   麦克风是一种将声波转换为电信号的设备。
3. 3. The scientist used an ultrasound to detect the presence of the fetus in the womb.
   科学家使用超声波来探测胎儿在子宫内的存在。