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
비례지례를 통해 우리는 두 개념의 유사성을 이해할 수 있다.Biryegireul tonghae urineun du gaenyeomui yusaseong-eul ihaehal su itda.Through proportional analogy, we can understand the similarities between the two concepts.