The key to sound transmission is vibration. When I talk, my vocal folds vibrate.

声音传播的关键是振动。当我说话时，我的声带会振动。当。

Did you know that alexander graham bell and eli gray Simultaneously invented electronic sound transmission devices?

你们知道吗? Alexander Graham Bell 和Eli Gray同时发明了电子声音传送装置？

Bell's researches have an interest only in that they taught him much about sound transmission and other kindred subjects and so paved the way for his great conception.

贝尔的研究只对他感兴趣， 因为它们教会了他很多关于声音传播和其他同类学科的知识， 从而为他的伟大构想铺平了道路。