You must know Beijing well. 你一定非常熟悉北京。
A: How many times have you been to Beijing?
A: 你来北京多少次了？
B: Lots of times. Sometimes for business, sometimes for holiday.
B: 很多次了。有时来出差，有时来度假。
A: You must know Beijing well now.
A: 你现在对北京一定非常了解了。
B: Well, I get to know it better every time I visit.
B: 哦，我一次比一次更了解北京。
A: That's good. I think it's better when you know a city well.
A: 好。我想当你了解一个城市的时候感觉更好。
B: Yes. You enjoy it more. It's more interesting.
B: 是的。你会更喜欢它。它会更有趣。