Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of East China's Jiangsu Province. (Xinhua/Fei Maohua)

Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

Artists perform during during the opening ceremony of Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China’s Jiangsu Province, Aug. 16, 2014. (Xinhua/Guo Chen)

Artists perform during during the opening ceremony of Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China’s Jiangsu Province, Aug. 16, 2014. (Xinhua/Guo Chen)

Chinese swimmer Tang Yi receives the flame from Chinese table tennis player Zhang Jike at the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Chen Cheng)

Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

The Photo taken on August. 16 shows the national flag of People’s Republic of China and the Olympic Flag at the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

The cauldron is lit during the opening ceremony of Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China’s Jiangsu Province, Aug. 16, 2014. (Xinhua/Yue Yuewei)

Chinese short track speed skater Zhou Yang receives the flame from Chinese badminton player Lin Dan during the opening ceremony of Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China’s Jiangsu Province, Aug. 16, 2014. (Xinhua/Meng Yongmin)

Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

The Photo taken on August. 16 shows a audience at the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

Zhang Jie and Zhang Liangying of China, Kim Soo Hyun of Republic of Korea and Molgun Galia of Russia(center, L-R) sing the theme Song "Light up the Future" during the opening ceremony of Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China’s Jiangsu Province, Aug. 16, 2014. (Xinhua/Zhao Peng)

Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Fei Maohua)

 Photo shows the scene of the opening ceremony of Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China’s Jiangsu Province, Aug. 16, 2014. (Xinhua/Yang Lei)

Artists perform during the Opening Ceremony of the Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China's Jiangsu Province. (Xinhua/Purbu Zhaxi)

An armillary sphere is set in the Nanjing Olympic Sports Centre Stadium during the opening ceremony of Nanjing 2014 Youth Olympic Games in Nanjing, capital of east China’s Jiangsu Province, Aug. 16, 2014. (Xinhua/Zhao Peng)