CHENGDU, Feb. 22 (Xinhua) -- A total of 231 health workers with medical supplies flied to Hubei on Friday to join in the battle against the novel conronavirus. [caption id="" align="alignnone" width="900"] A China's domestically-developed ARJ21 plane carrying medical workers prepares to take off at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 21, 2020.  (Xinhua/Liu Kun)[/caption] [caption id="" align="alignnone" width="900"] Medical workers on board a plane cheer for themselves before leaving for Hubei Province at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 21, 2020.  (Xinhua/Liu Kun)[/caption] [caption id="" align="alignnone" width="900"] Medical workers board China's domestically-developed ARJ21 plane before leaving for Hubei Province at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 21, 2020.  (Xinhua/Liu Kun)[/caption] [caption id="" align="alignnone" width="900"] A pilot of China's Chengdu Airlines salutes medical workers leaving for Hubei Province at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 21, 2020.  (Xinhua/Liu Kun)[/caption] [caption id="" align="alignnone" width="900"] Staff members load medical supplies on a plane at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 21, 2020.  (Xinhua/Liu Kun)[/caption] [caption id="" align="alignnone" width="900"] A China's domestically-developed ARJ21 plane carrying medical workers prepares to take off at Chengdu Shuangliu International Airport in Chengdu, southwest China's Sichuan Province, Feb. 21, 2020.  (Xinhua/Liu Kun)■[/caption]