�?블로�?전체 카테고리 글 전체글 보기 화면 최상단으�?이동 If a grammatical principle that is definitely added to 서툴�?is often a vowel �?and there's no other selection besides a vowel �?then that grammatical basic principle cannot be added to 서툴�? - 마스크의 기준: 성상, 형상, 순도(색�