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
봉쇄방재는 오염물질이 퍼지는 것을 방지하는 데 사용됩니다.bongsoebangjaeneun oyeommuljil-i peojineun geos-eul bangjihaneun de sayongdoemnida.The containment boom is used to prevent pollutants from spreading.