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Family members of Chicago police officers who sacrificed their lives last year attend an annual parade to commemorate the fallen heroes, in Chicago, the United States, on May 5, 2019. (Xinhua/Wang Ping)
Family members of Chicago police officers who sacrificed their lives last year attend an annual parade to commemorate the fallen heroes, in Chicago, the United States, on May 5, 2019. (Xinhua/Wang Ping)