�?블로�?전체 카테고리 글 전체글 보기 화면 최상단으�?이동 If a grammatical basic principle which is additional to 서툴�?is really a vowel �?and there's no other solution apart from a vowel �?then that grammatical theory can't be added to 서툴�? 상세하게 안내�?드리지 못하�?�?양해 �