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Chidlren wearing their cochleal implant at classroom of Deaf children rehabilitation school, Harbin city of China on march 2 2016.The Chinese government has attached great importance to prevention and rehabilitation of hearing impairment. The day of March 03 has been recognized as National Ear Day since 2000. (Photo by Tao Zhang/NurPhoto) (Photo by NurPhoto/NurPhoto via Getty Images)

Chidlren wearing their cochleal implant at classroom of Deaf children rehabilitation school, Harbin city of China on march 2 2016.The Chinese government has attached great importance to prevention and rehabilitation of hearing impairment. The day of March 03 has been recognized as National Ear Day since 2000. (Photo by Tao Zhang/NurPhoto) (Photo by NurPhoto/NurPhoto via Getty Images)