translation.en: Now as you may know, sound travels in waves, so if you have a speaker, a speaker actually does nothing else than taking the audio signal, transform it into a vibration, which is then transported through the air, is captured by our ear, and transformed into an audio signal again.
translation.zh: 你可能知道， 声音是通过音波来传输的， 如果你有个音箱， 音箱不会干别的 只会在获得音频信号后， 将其转化为振动， 再通过空气， 传到我们的耳朵里， 再重新转化为音频信号。