Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Michael Nagle)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Wang Ying)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Michael Nagle)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Michael Nagle)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Wang Ying)

Descriptions of relationships of New Yorkers lost to the COVID-19 pandemic are displayed on the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Michael Nagle)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Wang Ying)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Michael Nagle)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Wang Ying)

A band performs during a memorial ceremony in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Michael Appleton/Mayoral Photography Office/Handout via Xinhua)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Wang Ying)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Wang Ying)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Wang Ying)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Michael Nagle)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Michael Nagle)

Images of New Yorkers lost to the COVID-19 pandemic are projected onto the Brooklyn Bridge in New York, the United States, March 14, 2021. New York City held an official memorial ceremony on Sunday evening to honor more than 30,000 New Yorkers who died of COVID-19. The total number of New Yorkers lost to the COVID-19 pandemic is more than that died from World War II, the Vietnam War, hurricane Sandy and 911 attacks put together, said New York City Mayor Bill de Blasio. (Xinhua/Wang Ying)