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M: Excuse me. Do you have the time?  

W: Actually I'm not positive. But I'd say it's right around noon.

It's approximately twelve o'clock.

不太明白 I'm not positive的意思。是说她也不太知道么？感觉这道题怪怪的。

Do you have the time?是问时间

not positive，就是说不确定，可能没有手表什么的，但有根据猜测，所以才有后面的But I'd say it's right around noon.