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British Princess Anne leaves after the King's Troop Royal Horse Artillery fired a 41-round gun salute to mark Queen Elizabeth II's 93rd birthday in Hyde Park of London, Britain, April 22, 2019. (Xinhua/Tim Ireland)

British Princess Anne leaves after the King's Troop Royal Horse Artillery fired a 41-round gun salute to mark Queen Elizabeth II's 93rd birthday in Hyde Park of London, Britain, April 22, 2019. (Xinhua/Tim Ireland)