Doctor Li Xin (1st L) from Guangdong, who is now president of the People's Hospital of Nyingchi, demonstrates tracheal cannula to young doctors in Nyingchi, southwest China's Tibet Autonomous Region, Aug. 16, 2018. Guangdong Province has sent four batches of medical staff to the People's Hospital of Nyingchi in the past four years to provide better medical care services to local people. (Xinhua/Zhang Rufeng)