Ⅰ. not at all 是客套话，意为“别客气”相当于 That’s all right; You are welcome. 如：
①--Thank you very much. –Not at all.
Ⅱ. not…at all “根本不”;“一点也不”。at all 用以加强语气。如：
① She doesn’t like it at all. 她根本不喜欢它。
② He didn’t come at all. 他根本没来。
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