addition and reduction的用法和样例：
- Addition and division are forms of computation.
- The results showed that cryptoflavin was stable with these additives and was highly resistant to oxidation and reduction,but not to heat or light .
- By nucleophilic addition and reductive cyclization reaction of the three intermediates, respectively, some azo-heterocyclic derivatives containing a rosinyl skeleton were obtained.
- We do addition and subtraction in arithmetic.
- Addition and correction of icons for the many NPCs.