A: Can I buy some stamps and envelopes here?
这儿卖邮票和信封吗？
B: Yes. How many stamps and envelopes do you want to buy?
是的。您要买几张邮票和几个信封？
A: Excuse me. Could you tell me where I can get the registered envelope and some stamps?
请问我在哪儿能买到挂号信封和邮票？
B: At that counter.
在哪个柜台。