A teacher takes after children while they sleep at Huifeng Kindergarten in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, March 21, 2014. An activity aiming to guide children sleeping well is held at the kindergarten to mark the World Sleep Day which falls on Friday. (Xinhua/Peng Zhaozhi)
Chinese Vice President Li Yuanchao (2nd R), commissioned by President Xi Jinping, meets with Cambodian King Norodom Sihamoni (2nd L front), and his mother, former Queen Norodom Monineath Sihanouk (1st L), in Beijing, capital of China, March 21, 2014. (Xinhua/Xie Huanchi)
The Chinese icebreaker Xuelong, or Snow Dragon, awaits orders for the search of missing Malaysia Airlines flight MH370 at the port of Perth, a southwestern port city of Australia, March 20, 2014. Xuelong will set off to the waters where suspected debris of the missing flight MH370 has been found, according to the State Oceanic Administration of China. (Xinhua/Tang Zhijian)
Photo taken on March 20, 2014 shows a vehicle damaged in a road accident in the Mayang County under Huaihua City, central China's Hunan Province, March 20, 2014. Six people died and 16 were injured when a farm vehicle fell into a valley in a village of Mayang Miao Autonomous County under Huaihua City Thursday morning. Rescuers have rushed to the site and the injured people have been sent to hospital for treatment. The cause of the accident is still unknown. (Xinhua/Long Hongtao)
Snapshot taken from a video shows an injured being treated at a hospital in the Mayang County under Huaihua City, central China's Hunan Province, March 20, 2014
Two girls enjoy themselves among winter jasmines at Zhongshan Park in Jinan, capital of east China's Shandong Province, March 21, 2014. Friday marks "Chunfen" of this year, which literally means Spring Equinox or Vernal Equinox. It falls on the day when the sun is exactly at the celestial latitude of zero degrees. (Xinhua/Feng Jie)