【實用娛樂app】Can You Hear|最夯免費app-gigacircle

Students can hear, Teacher cannot

Children can hear, Parents cannot

Younger workers can hear, Boss cannot

Human hearing frequency range is 20-20000hertz, and between adults and young people, hearing also has subtle differences within certain frequencies of sound, as adults in long-term strain on the hearing, a lot of people in person to the began after the loss of high frequency hearing voices, and young people in this area are still some advantages, medically known as presbycusis. Most of the age of 40 or adults over age 50 have such symptoms