Aerial photo taken on June 12, 2020 shows a vessel and a fire engine extinguishing fire during the emergency drill at Macun port of Haikou Port in south China's Hainan Province. The drill held by the marine bureau of Haikou simulated an emergency situation caused by the leaking of a ship loaded with dangerous cargos. (Xinhua/Yang Guanyu)

Staff members clean dirt during the emergency drill at Macun port of Haikou Port in south China's Hainan Province, June 12, 2020. The drill held by the marine bureau of Haikou simulated an emergency situation caused by the leaking of a ship loaded with dangerous cargos. (Xinhua/Yang Guanyu)

Aerial photo taken on June 12, 2020 shows a vessel and a fire engine extinguishing fire during the emergency drill at Macun port of Haikou Port in south China's Hainan Province. The drill held by the marine bureau of Haikou simulated an emergency situation caused by the leaking of a ship loaded with dangerous cargos. (Xinhua/Yang Guanyu)

A vessel extinguishes fire during the emergency drill at Macun port of Haikou Port in south China's Hainan Province, June 12, 2020. The drill held by the marine bureau of Haikou simulated an emergency situation caused by the leaking of a ship loaded with dangerous cargos. (Xinhua/Yang Guanyu)

Firefighters extinguish fire during the emergency drill at Macun port of Haikou Port in south China's Hainan Province, June 12, 2020. The drill held by the marine bureau of Haikou simulated an emergency situation caused by the leaking of a ship loaded with dangerous cargos. (Xinhua/Yang Guanyu)