对话
a：hello , where is a post office ?
b::you can go by the no.13 bus .
a: where is a bus stop ?
b: let me see .
a: it is near the liarbry .
b: ?
a: go straght ,then turn right .
b: thanks ,what is your name?
a: my name is amy .
b: my name is chenjie . neet to meet you.
a: me too .
b: goodbye .
a: bye.