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People visit a dahlia flower exhibition in San Francisco, the United States, Aug. 17, 2019. A dahlia flower exhibition is held at the Golden Gate Park in San Francisco on Saturday. (Photo by Li Jianguo/Xinhua)
People visit a dahlia flower exhibition in San Francisco, the United States, Aug. 17, 2019. A dahlia flower exhibition is held at the Golden Gate Park in San Francisco on Saturday. (Photo by Li Jianguo/Xinhua)