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
성취동기는 개인의 목표 달성을 위한 중요한 요소입니다.seongchwidonggi-neun gaein-ui mokpyo dalseong-eul wihan jungyohan yoso-imnida.Achievement motivation is an important factor for an individual's goal attainment.