The 'backward social production' has been changed into 'unbalanced development.'

落后的社会生产力’转变为了‘不平衡的发展’。

On one h and, China has a vast territory, many ethnic groups, and unbalanced economic and cultural development in different regions.

一方面，中国幅员辽阔，民族众多，不同地区经济文化发展不平衡。