A street is left nearly empty amid the COVID-19 pandemic in Sydney, Australia, on June 26, 2021. Australia's most populous state of New South Wales (NSW) on Saturday extended lockdown to more areas as local transmission in the biggest city of Sydney still increased. (Photo: Xinhua)

A shopping mall is visited by few customers amid the COVID-19 pandemic in Sydney, Australia, on June 26, 2021. Australia's most populous state of New South Wales (NSW) on Saturday extended lockdown to more areas as local transmission in the biggest city of Sydney still increased. (Photo: Xinhua)

A staff member works at a cafe in Sydney, Australia, on June 26, 2021. Australia's most populous state of New South Wales (NSW) on Saturday extended lockdown to more areas as local transmission in the biggest city of Sydney still increased. (Photo: Xinhua)

Medical staff members work at a COVID-19 test center in Sydney, Australia, on June 26, 2021. Australia's most populous state of New South Wales (NSW) on Saturday extended lockdown to more areas as local transmission in the biggest city of Sydney still increased. (Photo: Xinhua)