Medical workers arrive at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, April 7, 2020. The last batch of 162 medical workers returned to Sichuan on Tuesday after aiding the fight against the COVID-19 in central China's Hubei Province. (Xinhua/Wang Xi)

An airplane carrying medical workers supporting virus-hit Hubei Province receives a water salute at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, April 7, 2020. The last batch of 162 medical workers returned to Sichuan on Tuesday after aiding the fight against the COVID-19 in central China's Hubei Province. (Xinhua/Wang Xi)

Medical workers arrive at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, April 7, 2020. The last batch of 162 medical workers returned to Sichuan on Tuesday after aiding the fight against the COVID-19 in central China's Hubei Province. (Xinhua/Wang Xi)

Medical workers arrive at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, April 7, 2020. The last batch of 162 medical workers returned to Sichuan on Tuesday after aiding the fight against the COVID-19 in central China's Hubei Province. (Xinhua/Wang Xi)