【求助】这句英语不太懂，扩号里的，请指教，谢谢！
这个帖子发布于 20 年零 118 天前，其中的信息可能已发生改变或有所发展。
The authors should submit all the following files:
1. An official letter (paper with the heading of the institute, laboratory or company submitting the manuscript) signed by one of the authors, scanned as an image or pdf file.
1. An official letter (paper with the heading of the institute, laboratory or company submitting the manuscript) signed by one of the authors, scanned as an image or pdf file.
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