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
선박의 안정성을 높이기 위해 밸러스트용철괴를 사용합니다.seonbak-ui anjeongseong-eul nopi-gi wihae baelleoseuteuyongcheolgoe-reul sayonghamnida.We use kentledge to improve the stability of the ship.