This is a question I got from a reader, an anonymous reader, and the subject line just said, "Urgent," and this was the entire email: "If people had wheels and could fly, how would we differentiate them from airplanes?"
이건 제 독자로 부터 받은 질문인데요. 익명의 독자예요. 제목에는 "급함"이라고 쓰여있었어요. 이게 메일의 전부인데요. "사람도 날개있어서 날 수 있다면 사람과 비행기를 어떻게 구별할까요?"