Children have fun at the first modern amusement park in Lhasa, capital of southwest China's Tibet Autonomous Region, May 31, 2013. Designed for children and appropriately named "Happy Baby" in the Tibetan language, the park started business Friday to mark the International Children's Day. [Photo/Xinhua]

Children have fun at the first modern amusement park in Lhasa, capital of southwest China's Tibet Autonomous Region, May 31, 2013. Designed for children and appropriately named "Happy Baby" in the Tibetan language, the park started business Friday to mark the International Children's Day. [Photo/Xinhua]

Children enjoys a Ferris wheel at the first modern amusement park in Lhasa, capital of southwest China's Tibet Autonomous Region, May 31, 2013. Designed for children and appropriately named "Happy Baby" in the Tibetan language, the park started business Friday to mark the International Children's Day. [Photo/Xinhua]

Children pose for a photo at the first modern amusement park in Lhasa, capital of southwest China's Tibet Autonomous Region, May 31, 2013. Designed for children and appropriately named "Happy Baby" in the Tibetan language, the park started business Friday to mark the International Children's Day. [Photo/Xinhua]

A Ferris wheel is seen at the first modern amusement park in Lhasa, capital of southwest China's Tibet Autonomous Region, May 31, 2013. Designed for children and appropriately named "Happy Baby" in the Tibetan language, the park started business Friday to mark the International Children's Day. [Photo/Xinhua]

Children have fun at the first modern amusement park in Lhasa, capital of southwest China's Tibet Autonomous Region, May 31, 2013. Designed for children and appropriately named "Happy Baby" in the Tibetan language, the park started business Friday to mark the International Children's Day. [Photo/Xinhua]