A girl salutes firefighters from Yunnan Province in Beibei District of southwest China's Chongqing, Aug. 28, 2022. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Zhu Gaoxiang)

A firefighter from Yunnan Province gives a "finger heart" to residents in Beibei District of southwest China's Chongqing, Aug. 28, 2022. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Huang Wei)

Aerial photo taken on Aug. 28, 2022 shows residents seeing off firefighters from Yunnan Province in Beibei District of southwest China's Chongqing. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Zhu Gaoxiang)

Aerial photo taken on Aug. 28, 2022 shows residents seeing off firefighters from Yunnan Province in Beibei District of southwest China's Chongqing. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Huang Wei)

Firefighters from Yunnan Province assemble before leaving in Beibei District of southwest China's Chongqing, Aug. 28, 2022. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Zhu Gaoxiang)

Residents see off firefighters from Yunnan Province in Beibei District of southwest China's Chongqing, Aug. 28, 2022. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Huang Wei)

Aerial photo taken on Aug. 28, 2022 shows residents seeing off firefighters from Yunnan Province in Beibei District of southwest China's Chongqing. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Huang Wei)

Aerial photo taken on Aug. 28, 2022 shows residents seeing off firefighters from Yunnan Province in Beibei District of southwest China's Chongqing. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Huang Wei)

A boy salutes firefighters from Yunnan Province in Beibei District of southwest China's Chongqing, Aug. 28, 2022. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Huang Wei)

Residents see off firefighters from Yunnan Province in Beibei District of southwest China's Chongqing, Aug. 28, 2022. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Huang Wei)

A firefighter from Yunnan Province bids farewell to residents in Beibei District of southwest China's Chongqing, Aug. 28, 2022. Over 300 firefighters from Yunnan Province left Chongqing after all open flames of the wildfires that broke out in Chongqing recently had been put out. (Xinhua/Huang Wei)