Clay: They are designed for self-study only. 자가학습용으로만 만들어진 책이에요. Jun: I was confused. 제가 혼동을 했었어요. Clay: Do you want a book that includes free online lessons? 무료 인터넷 강의가 있는 스타일을 원하세요? Jun: I'll be happy if you have one. 그런게 있다면 좋겠네요.