Renumber Figure 2 and Figure 3 to Figure 7 and Figure 6 respectively.

把图2和图3依序重新编号为图7和图6。

If you later add more equations to the paper before the referenced equation, all the equations will automatically renumber and the cross-references will update.

就算以后您在入新的公式，它们都动编号，交叉引用编号动修改。