In this file photo taken on July 28, 2006, children ride a thrill machine at an amusement park in Hangzhou, east China's Zhejiang Province. As China celebrates the International Children's Day, there arises the occasion for grown-ups to think back over the joys of childhood. With the evolution of technology and lifestyle, children are exposed to a wider range of entertainment. Nevertheless, joy would remain a childhood motif no matter how its forms change with time. (Xinhua/Shao Quanda)