编辑信的部分内容：
I would like to make clear, that your paper will be rejected for language reasons, if you do
not have the English of your work improved by a professional language service before you
submit a revised version. Furthermore, you must provide written proof that you have
followed this procedure.
编辑提出这样的修改意见如何处理？具体该如何操作？
另外，written proof指的是什么？
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