Visitors look at a new energy bus during a promotional activity for new energy vehicles (NEVs) in rural areas held in Kunming, southwest China's Yunnan Province, Dec. 4, 2020. (Xinhua/Jiang Wenyao)

Photo taken on Dec. 4, 2020 shows new energy vehicles (NEVs) during a promotional activity for NEVs in rural areas held in Kunming, southwest China's Yunnan Province. (Xinhua/Jiang Wenyao)

A visitor experiences a new energy vehicle (NEV) at a promotional activity for NEVs in rural areas held in Kunming, southwest China's Yunnan Province, Dec. 4, 2020. (Xinhua/Jiang Wenyao)

Photo taken on Dec. 4, 2020 shows new energy vehicles (NEVs) during a promotional activity for NEVs in rural areas held in Kunming, southwest China's Yunnan Province. (Xinhua/Jiang Wenyao)