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很多SCI期刊在投稿的时候都要求你附上cover letter,声明文章的原创性及文章是没有发表过的，没有任利益冲突的，cover letter的一般写法如下：
Dear Editor,
We would like to submit an original (or a review) article entitled “XXXX (title of the article) for consideration for publication in XXXX (name of the journal).
(You may use one paragraph to summarize the significance or merits of the present study here.) This article has not been published elsewhere in whole or in part. All authorshave read and approved the content, and agree to submit for consideration for publication in the journal. There are no any ethical/legal conflicts involved in the article.
This manuscript has been edited and proofread by Medjaden Bioscience Limited.
Your consideration for this manuscript is highly appreciated.
Looking forward to hearing from you soon.
With kind regards,
Yours sincerely,
XXXX (name of the corresponding author)
XXX (title of the corresponding author)
Corresponding author
E-mail: XXXXXXXX