都是时间状语,但前者是强调用法,后者是普通用法,且口语中常用 till 替代. Not until recently did I see your question posted there. I read the question you posted there until/till recently. 既然是强调用法嘛,当然语气更重一些哈.而且前者只能用于句首并要部份倒装,后者相对较为灵活,可前可后,不过用于句首时还是推荐使用 not until 的结构,除非你不想过于强调该时间节点.如 Until recently I had never heared from you.
