The upper part of this combo photo taken in 1985 shows eight-year-old Cui Bo (L) and her younger brother Cui Jian posing for a photo with a telephone model at home in Jiagedaqi District of the Greater Hinggan Mountains area, northeast China's Heilongjiang Province. At that time, they lived with their parents in a 48-square-meter bungalow and the heating solely depended on a home furnace in winter. The lower part of the combo photo taken by Wang Kai on Aug. 29, 2018 shows 41-year-old Cui Bo and her younger brother Cui Jian posing for a photo at home in Jiagedaqi District. The sister and the brother, who respectively reside in high storey residential communities, enjoy the centralized heating system in winter. (Xinhua/Wang Kai)