Visitors view a car of Volvo at Haikou New Energy Vehicle Exhibition in Haikou, south China's Hainan Province, Jan. 10, 2019. A total of 197 new energy vehicles were displayed at the exhibition. (Xinhua/Yang Guanyu)

Visitors view the chassis of a car displayed at Haikou New Energy Vehicle Exhibition in Haikou, south China's Hainan Province, Jan. 10, 2019. A total of 197 new energy vehicles were displayed at the exhibition. (Xinhua/Yang Guanyu)

Visitors view a car from U.S. electric car maker Tesla at Haikou New Energy Vehicle Exhibition in Haikou, south China's Hainan Province, Jan. 10, 2019. A total of 197 new energy vehicles were displayed at the exhibition. (Xinhua/Yang Guanyu)

Visitors view a new energy car of Jaguar at Haikou New Energy Vehicle Exhibition in Haikou, south China's Hainan Province, Jan. 10, 2019. A total of 197 new energy vehicles were displayed at the exhibition. (Xinhua/Yang Guanyu)

Visitors view a car from U.S. electric car maker Tesla at Haikou New Energy Vehicle Exhibition in Haikou, south China's Hainan Province, Jan. 10, 2019. A total of 197 new energy vehicles were displayed at the exhibition. (Xinhua/Yang Guanyu)

Visitors view a car from Chinese electric automaker Qiantu at Haikou New Energy Vehicle Exhibition in Haikou, south China's Hainan Province, Jan. 10, 2019. A total of 197 new energy vehicles were displayed at the exhibition. (Xinhua/Yang Guanyu)

Visitors view a car from German carmaker BMW at Haikou New Energy Vehicle Exhibition in Haikou, south China's Hainan Province, Jan. 10, 2019. A total of 197 new energy vehicles were displayed at the exhibition. (Xinhua/Yang Guanyu)

Visitors view a car from Chinese electric automaker Nio at Haikou New Energy Vehicle Exhibition in Haikou, south China's Hainan Province, Jan. 10, 2019. A total of 197 new energy vehicles were displayed at the exhibition. (Xinhua/Yang Guanyu)

Visitors view the concept car EVE from Chinese electric automaker Nio at Haikou New Energy Vehicle Exhibition in Haikou, south China's Hainan Province, Jan. 10, 2019. A total of 197 new energy vehicles were displayed at the exhibition. (Xinhua/Yang Guanyu)