Hearing problems like1) tinnitus, once2) encountered mostly in old age, are now affecting people in their teens and twenties, and3) audiologists have identified the4) culprit: earphones.

• 像耳鸣这类以往老年才会遇到的听力问题，现在十几、十岁的人就碰上了，而听力专家已经找出元凶：耳机。