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
이 건물의 횡단면을 보면 구조를 이해할 수 있습니다.I geonmul-ui hoengdanmyeon-eul bomyeon gujo-reul ihaehal su isseumnida.If you look at the cross section of this building, you can understand the structure.