A helicopter of China's air force returns from Nepal, in Gyirong County, southwest China's Tibet Autonomous Region, May 6, 2015. Three helicopters from China's air force flew to Nepal on Wednesday morning to help with transportation and rescue. (Xinhua/Wang Shoubao) 

An inspection and quarantine worker measures body temperature for a helicopter crew member in Gyirong County, southwest China's Tibet Autonomous Region, May 6, 2015. Three helicopters from China's air force flew to Nepal on Wednesday morning to help with transportation and rescue. (Xinhua/Wang Shoubao)

An inspection and quarantine worker sanitizes a helicopter in Gyirong County, southwest China's Tibet Autonomous Region, May 6, 2015. Three helicopters from China's air force flew to Nepal on Wednesday morning to help with transportation and rescue. (Xinhua/Wang Shoubao)