发了篇收费的论文，版面费用交付后，编辑给回了封信，但最后一句话没有看明白，请各位帮忙看下是什么意思？大感谢。
Dear author,
We have received your publication tax, you can find attached the copy
proof of the paper accepted for publication. Please send it back after
the required modifications together with the copyrightform. You also
have attached the final invoice regarding your transfer.
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