A staff member sprays disinfectant at an outdoor voting center in San Francisco, California, the United States, Oct. 5, 2020. San Francisco has set up an outdoor voting center outside the City Hall to provide service for voters since Oct. 5 during the COVID-19 pandemic. (Photo by Li Jianguo/Xinhua)

People are seen at an outdoor voting center in San Francisco, California, the United States, Oct. 5, 2020. San Francisco has set up an outdoor voting center outside the City Hall to provide service for voters since Oct. 5 during the COVID-19 pandemic. (Photo by Li Jianguo/Xinhua)

People are seen at an outdoor voting center in San Francisco, California, the United States, Oct. 5, 2020. San Francisco has set up an outdoor voting center outside the City Hall to provide service for voters since Oct. 5 during the COVID-19 pandemic. (Photo by Li Jianguo/Xinhua)

People are seen at an outdoor voting center in San Francisco, California, the United States, Oct. 5, 2020. San Francisco has set up an outdoor voting center outside the City Hall to provide service for voters since Oct. 5 during the COVID-19 pandemic. (Photo by Li Jianguo/Xinhua)

Photo taken on Oct. 5, 2020 shows a sign of the outdoor voting center outside the City Hall in San Francisco, California, the United States. San Francisco has set up an outdoor voting center outside the City Hall to provide service for voters since Oct. 5 during the COVID-19 pandemic. (Photo by Li Jianguo/Xinhua)

People talk at an outdoor voting center in San Francisco, California, the United States, Oct. 5, 2020. San Francisco has set up an outdoor voting center outside the City Hall to provide service for voters since Oct. 5 during the COVID-19 pandemic. (Photo by Li Jianguo/Xinhua)