Why does all that vibration sound like a voice?

为什么所有的振动听起来像一个声音呢？

And just hearing this vibration sound in her house, primarily, that's where it was loudest.

只是在她的房子里听到这种振动声， 主要是那里声音最大。

Like playing a guitar string, singers use their vocal cords - a pair of folds in the throat that are stretched over the larynx, or voice box, another part of the throat, to produce a sound vibration - a quick, shaking movement.

就像吉他的弦一样，歌手们使用他们的声带 —— 喉咙里的一对褶层，位于声匣上，喉咙的另一个部位，发出声音的震动 —— 快速的抖动。