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
노인학의 연구는 노인의 삶의 질을 향상시키는 데 중요하다.noinhak-ui yeonguneun noin-ui salm-ui jil-eul hyangsang-sikineun de jungyohada.Gerontological research is important for improving the quality of life of the elderly.