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
변전소는 전기를 분배하는 중요한 시설입니다.byeonjeonso-neun jeongireul bunbae-haneun jungyohan siseul-imnida.The power substation is an important facility for distributing electricity.