Xinxin gestures as volunteer Gu Shengyuan (L) cheers during a rope skipping game 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.

Volunteer Gu Shengyan (1st L) plays rope skipping game with Nuonuo (2nd L) in Wucun Village of Linyi City, east China's Shandong Province, Jan. 16, 2019.

Xinxin (L) learns dancing with volunteer Du Linhong in Wucun Village of Linyi City, east China's Shandong Province, Jan. 16, 2019.

Volunteer Gu Shengyan (C) puts dumplings into boiling water with Xinxin (L) and Nuonuo in Wucun Village of Linyi City, east China's Shandong Province, Jan. 16, 2019.

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.

Nuonuo (1st L) and Xinxin (2nd R) learn dancing with volunteers in Wucun Village of Linyi City, east China's Shandong Province, Jan. 16, 2019.

Xinxin (1st L) and Nuonuo (1st R) make dumplings with volunteers in Wucun Village of Linyi City, east China's Shandong Province, Jan. 16, 2019.

Volunteer Gu Shengyuan (R) hugs Nuonuo in Wucun Village of Linyi City, east China's Shandong Province, Jan. 16, 2019. (Photos: Xinhua/Guo Xulei)