往Journal of control released投稿整理格式时发现下面一句话，不知道什么意思，请前辈给指点指点，
It is recommended that all articles do not exceed a total of 14 single-spaced, font size 12, typewritten pages, including references, tables, figure legends and figures.
特别是 total of 14 single-spaced，这个应该怎么理解？
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