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
국가 간의 예양은 국제 관계를 개선하는 데 중요하다.gukga gan-ui ye-yang-eun gukje gwangye-reul gaeseonhaneun de jungyohada.Comity between nations is important for improving international relations.