Supermarkets, online groceries and food processors in the city are working at full steam in Shanghai to ensure supply in locked-down areas.The city launched an eight-day lockdown on the Pudong New Area and Puxi, respectively, in turn for a new round of massive nucleic acid testing from Monday morning to curb the spread of the COVID-19 resurgence.Carrefour outlets have ordered 20 to 50 percent more vegetables, meat and eggs so that shoppers' demand can be fully met.