A man waits to pick up his take away food outside a restaurant in San Mateo city, California, the United States, May 5, 2021. San Mateo county, where San Mateo city sits, is currently at the less restrictive orange tier in COVID-19 control. (Photo: Xinhua)

People walk past a restaurant in San Mateo city, California, the United States, May 5, 2021. San Mateo county, where San Mateo city sits, is currently at the less restrictive orange tier in COVID-19 control. (Photo: Xinhua)

A woman sits on a bench outside a restaurant in San Mateo city, California, the United States, May 5, 2021. San Mateo county, where San Mateo city sits, is currently at the less restrictive orange tier in COVID-19 control. (Photo: Xinhua)

A pedestrian and her pet dog cross a street in San Mateo city, California, the United States, May 5, 2021. San Mateo county, where San Mateo city sits, is currently at the less restrictive orange tier in COVID-19 control. (Photo: Xinhua)

A boy spends time at a park in San Mateo city, California, the United States, May 5, 2021. San Mateo county, where San Mateo city sits, is currently at the less restrictive orange tier in COVID-19 control. (Photo: Xinhua)

Local residents chat outside a restaurant in San Mateo city, California, the United States, May 5, 2021. San Mateo county, where San Mateo city sits, is currently at the less restrictive orange tier in COVID-19 control. (Photo: Xinhua)

A man waits to cross a street in San Mateo city, California, the United States, May 5, 2021. San Mateo county, where San Mateo city sits, is currently at the less restrictive orange tier in COVID-19 control. (Photo: Xinhua)