A：Excuse me,can you tell me where the post office is?打扰一下,请问邮局在哪儿?
B：It's on the Fifth Avenue.在第五大街.
A：I'm afraid I don't quite understand.我不大明白.
B：I see.You're a stranger here.Walk two blocks ahead, then turn left. You can't miss it.我知道了,你没来过这儿.向前走两个街区,然后向左拐就到了.