Aerial view of Daqing, northeast China's Heilongjiang

Aerial photo taken on Sept. 9, 2021 shows the PetroChina Daqing Petrochemical Company in Daqing, northeast China's Heilongjiang Province.

Aerial photo taken on Sept. 8, 2021 shows a demonstration zone of Daqing Oilfield in Daqing, northeast China's Heilongjiang Province.

Aerial photo shows the sunset view of Daqing Oilfield in Daqing, northeast China's Heilongjiang Province, May 24, 2021.

Bullet train runs above paddy fields in Gula Township, Guangxi Experts guide COVID-19 prevention and control at high and medium COVID-19 risk areas in Xiamen