江苏省药物研究所:look as if butter would not melt in one's mouth. 这句是什么意思？

look as if butter would not melt in one's mouth. 这句是什么意思？ look on as是什么意思 as if 怎么用？ as if 怎么用？ as if 的用法 as if 的用法 as和as if的异同 if as 和 as if 的区别是什么? only if和as long as有什么区别 as if/though造句2个！‘