最近投了一篇稿件，现在让修改，其中一个审稿人说了这样一段话，我感觉不是很明白，请大家帮忙：
Provide a number based reference system to track the compounds
throughout the manuscript. These may be introduced in page 4,5 with the
compounds and linked to the structures in equations (3) to (9).
多谢各位！
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