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
실험당은 새로운 약물의 효과를 테스트하는 데 사용됩니다.Silheomdang-eun saeroun yagmul-ui hyogwa-reul teseuteuhaneun de sayongdoemnida.The experiment group is used to test the effects of a new drug.