FILE PHOTO: A woman wearing a mask is seen at Heathrow airport, London, April 5, 2020. [Photo/Agencies]

Workers disinfect a closed restaurant in Rome, Italy, April 30, 2020. [Photo/Xinhua]

Residents watch a film screened on the wall at the rue Daubenton in Paris, France, May 1, 2020. [Photo/Xinhua]

Isabel Diaz Ayuso (2nd L F), president of the Madrid Region, Mayor of Madrid Jose Luis Martinez Almeida (2nd R) and staff members applaud during the closing ceremony of a field hospital built to treat COVID-19 patients in Madrid, Spain, May 1, 2020.[Photo/Xinhua]