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
축열료는 에너지 효율성을 높이는 데 사용됩니다.Chukyeollyoneun eneoji hyoyulseong-eul nopihaneun de sayongdoemnida.The regenerative furnace is used to increase energy efficiency.