Children from northwest China's quake-hit Yushu Prefecture pose with vulunteers in Tianjin, north China, May 31, 2010. A total of 14 students from the quake-hit Yushu Prefecture of northwest China's Qinghai Province were invited to visit Tianjin to celebrate the International Children's Day. They will tour Tianjin and make friends with local families. (Xinhua/Liu Dongyue)