Tinnitus has been bothering humanity since Ancient Babylon, plaguing everyone from Leonardo da Vinci to Charles Darwin. Today, roughly one in seven people worldwide experience this auditory sensation. So what exactly is tinnitus, and where does this persistent sound come from?

自古巴比伦以来，耳鸣一直困扰着人类，从达芬奇到查尔斯-达尔文都受到困扰。今天，全世界大约有七分之一的人经历过这种听觉感受。那么，究竟什么是耳鸣，这种持续的声音从何而来？