不客气，这是我为朋友起码可以做到的，顺便一提，你能帮我个忙作为回报吗？
Don't mention it. It's the least I can do for a friend. By the way, you can do me a favor in return.
可以帮我一个忙吗？可以帮我还书到图书馆吗？
Can you do me a favour? Would you help me return these books to the library?
可以帮我一个忙吗？可以帮我还书到图书馆吗？
Can you do me a favour? Would you help me return these books to the library?
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