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A man wearing a face mask walks in the Champ de Mars in Paris, France, on March 19, 2021. French Prime Minister Jean Castex on Thursday announced "new massive measures" to curb COVID-19 in the country's 16 worst-hit regions, including Paris. Starting Friday midnight, about 18 million French people in regions such as Paris, Hauts-de-France in the north as well as the Alpes-Maritimes on the Mediterranean should stay at home, Castex announced at a press briefing on the epidemic situation. (Xinhua/Gao Jing)