The upper part of this combo photo taken in 1986 shows eight-year-old Zhai Hongjuan (L) and her elder sister Zhai Hongying doing housework in Sihong County of Suqian City, east China's Jiangsu Province. At that time, their home was about 70 square meters. The lower part of the combo photo taken by Li Bo on Nov. 22, 2018 shows the sisters preparing lunch at home in Sihong County. They are now living in an apartment of over 100 square meters equipped with modern home appliances. (Xinhua)