People enjoy the sunshine in St. James's Park in London, Britain, Sept. 8, 2021. (Photo: Xinhua)

People walk in St. James's Park in London, Britain, Sept. 8, 2021. (Photo: Xinhua)

People enjoy the sunshine in St. James's Park in London, Britain, Sept. 8, 2021. (Photo: Xinhua)

People enjoy the sunshine in St. James's Park in London, Britain, Sept. 8, 2021. (Photo: Xinhua)

People enjoy the sunshine in St. James's Park in London, Britain, Sept. 8, 2021. (Photo: Xinhua)