Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
음향반사판은 소리를 반사하여 음향을 개선하는 데 사용됩니다.eumhyangbansapan-eun sorireul bansahayeo eumhyang-eul gaeseonhaneun de sayongdoemnida.The acoustic reflector is used to improve sound by reflecting it.