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The Canadian Snowbirds fly over the Golden Gate Bridge in an air show of the annual Fleet Week activities in San Francisco, the United States, on Oct. 7, 2017. (Xinhua/Wu Xiaoling)
The Canadian Snowbirds fly over the Golden Gate Bridge in an air show of the annual Fleet Week activities in San Francisco, the United States, on Oct. 7, 2017. (Xinhua/Wu Xiaoling)