than引导的比较状语从句可以倒装，如：
Developing provinces experienced a greater growth rate than did developed provinces. 发展中省份比发达省份经历了更大的增长率。
than did developed provinces是倒装形式，正常语序为than developed provinces did，did是助动词，代替了动词experienced，可以起到避免重复的效果，与Yes, I did/No, I didn’t中的did是一样的。
对于这种倒装，需要明确3点：
