certainly not用在什么地方
可用在句中或句末，例如： 1.He's very attractive, though certainly not a ladykiller他很有魅力，虽然还不至于使女人一见倾心。 2.The students were certainly not wanting in enthusiasm.学生们当然不乏热情。 3.Doing it once was just about excusable ─ doing it twice was certainly not...