German doctors have warned thatheadbanging could be bad for you. Headbanging is a dance from heavy metal music. Dancers shake their heads backwards and forwards, from side to side, very quickly. Doctors say the dance could lead to brain injury. They recently treated a 50-year-old heavy metal fan. His headbanging led to brain damage. The man had no history of head injuries but had been headbanging for many years. The doctors said the risk of brain damage from headbanging was low. They said heavy metal fans do not need to stop doing the dance.
The man had bad headaches after going to a concert. He had a brain scan at a hospital. Doctors found bleeding inside his brain. He had an operation to repair the damage. Doctors drilled a hole in his brain to release the blood. Two months later, his headaches disappeared. The head doctor said: "We are not against headbanging. The risk of injury is very, very low. If our patient had gone to a classical concert, this would not have happened." He said heavy metal fans should carry on dancing, saying: " Rock 'n' roll will never die. Heavy metal fans should rock on."
1. What does the underlined word “headbanging” mean in Chinese?