Volunteer Gu Shengyuan pastes a poster of the Chinese character "Fu", which means good luck, on a door with Nuonuo (front) in Wucun Village of Linyi City, east China's Shandong Province, Jan. 16, 2019. Twin sisters Gu Shengyuan and Gu Shengyan are members of a voluntary service group helping orphaned and impoverished children living in mountainous areas in Linyi. Established on April 19, 2018, the group with over 6,000 volunteers provides support for more than 3,500 orphaned and impoverished children. (Xinhua/Guo Xulei)