区别是:Not at all指的是一点也不,根本不。certainly not指的是不,当然不行;决不。
例句辨析:Not at alI am not an obsessive. Not at all. 我不是个强迫症患者,完全不是。2、It's not at all certain whether I'll come tomorrow. 我明天还不定来不来呢。
certainly not1、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、I don't know just exactly how old his child is, but certainly not older than twenty.他的孩子究竟多大我不清楚,反正不超过20岁。
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