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
언어의 폐습화는 학습자에게 큰 장애물이 될 수 있다.eoneoui pyeoseuphwaneun hakseupjaegeun keun jang-aemuli doel su itda.The fossilization of a language can be a major obstacle for learners.