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Jack ：
Can you be here by six?
你六点以前能到吗？
Mary：
Normally I could, but the thing is I have a doctor's appointment at 4:30, so that would be pushing it.
本来可以，不过因为四点半约好了见医生，恐怕要推迟些。
Jack ：
How about 6:30 then?
六点半如何？
Mary：
O.K. It's a date.
好的，说定了。