- 비말은 비오일성(기름입자가 아님)이므�? 오일 성분�?차단능력은 크게 중요하지 않다. If a grammatical basic principle that is added to 서툴�?can be a vowel �?and there is no other choice besides a vowel �?then that grammatical principle cannot be extra to 서툴�? If a grammatical principle that's extra to 서둘�?can be waiting for link from Forum Profiles (6)