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People attend a commemorative event to celebrate the 150th anniversary of the completion of the first U.S. Transcontinental Railroad in the California capital of Sacramento, the United States, May 8, 2019. (Xinhua/Wu Xiaoling)
People attend a commemorative event to celebrate the 150th anniversary of the completion of the first U.S. Transcontinental Railroad in the California capital of Sacramento, the United States, May 8, 2019. (Xinhua/Wu Xiaoling)