A woman visits the San Francisco Museum of Modern Art in San Francisco, California, the United States, March 13, 2021. San Francisco has advanced from the purple tier to the less restrictive red tier in COVID-19 control. (Photo by Li Jianguo/Xinhua)
People visit the San Francisco Museum of Modern Art in San Francisco, California, the United States, March 13, 2021. San Francisco has advanced from the purple tier to the less restrictive red tier in COVID-19 control. (Photo by Li Jianguo/Xinhua)
People visit the San Francisco Museum of Modern Art in San Francisco, California, the United States, March 13, 2021. San Francisco has advanced from the purple tier to the less restrictive red tier in COVID-19 control. (Photo by Li Jianguo/Xinhua)