Aerial photo taken on July 28, 2020 shows the expressway linking Tengchong and Longchuan in southwest China's Yunnan Province. The expressway opened to traffic on Aug. 15, 2020. (Photo by Zhu Bianyong/Xinhua)

Aerial photo taken on July 28, 2020 shows the expressway linking Tengchong and Longchuan in southwest China's Yunnan Province. The expressway opened to traffic on Aug. 15, 2020. (Photo by Zhu Bianyong/Xinhua)

Aerial photo taken on July 28, 2020 shows the expressway linking Tengchong and Longchuan in southwest China's Yunnan Province. The expressway opened to traffic on Aug. 15, 2020. (Photo by Zhu Bianyong/Xinhua)

Aerial photo taken on July 28, 2020 shows the expressway linking Tengchong and Longchuan in southwest China's Yunnan Province. The expressway opened to traffic on Aug. 15, 2020. (Photo by Zhu Bianyong/Xinhua)

Aerial photo taken on July 28, 2020 shows the expressway linking Tengchong and Longchuan in southwest China's Yunnan Province. The expressway opened to traffic on Aug. 15, 2020. (Photo by Zhu Bianyong/Xinhua)

Aerial photo taken on July 28, 2020 shows the expressway linking Tengchong and Longchuan in southwest China's Yunnan Province. The expressway opened to traffic on Aug. 15, 2020. (Photo by Zhu Bianyong/Xinhua)