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
행태주의적 접근은 인간 행동을 이해하는 데 중요하다.haengtaejuuijeok jeobgeun-eun ingan haengdong-eul ihaehaneun de jungyohada.A behavioral approach is important for understanding human behavior.