New Words：

at all 完全；根本；一点也不；丝毫
Not at all 一点也不；根本不；不用谢；别客气

Sample Sentences：

I don't like swimming at all.
She did not know Chinese at all, even pinyin!
You must be very patient. Do not move at all until I tell you.

"Thank you for helping me. " "Not at all. "
Would you mind if I turn off the radio? --Not at all.
'Thank you very much for speaking with us.' — 'Not at all.'

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