Visitors view artworks by Andy Warhol during an exhibition at Tate Modern art gallery in London, Britain, Aug. 1, 2020. The Tate Modern, Tate Britain, Tate Liverpool and Tate St Ives art galleries reopened to the public. (Xinhua/Han Yan)

A visitor views a piece of artwork by Andy Warhol during an exhibition at Tate Modern art gallery in London, Britain, Aug. 1, 2020. The Tate Modern, Tate Britain, Tate Liverpool and Tate St Ives art galleries reopened to the public. (Xinhua/Han Yan)

A visitor wearing a face mask views artworks by Andy Warhol during an exhibition at Tate Modern art gallery in London, Britain, Aug. 1, 2020. The Tate Modern, Tate Britain, Tate Liverpool and Tate St Ives art galleries reopened to the public. (Xinhua/Han Yan)

Visitors view artworks by Andy Warhol during an exhibition at Tate Modern art gallery in London, Britain, Aug. 1, 2020. The Tate Modern, Tate Britain, Tate Liverpool and Tate St Ives art galleries reopened to the public. (Xinhua/Han Yan)

Visitors view artworks by Andy Warhol during an exhibition at Tate Modern art gallery in London, Britain, Aug. 1, 2020. The Tate Modern, Tate Britain, Tate Liverpool and Tate St Ives art galleries reopened to the public. (Xinhua/Han Yan)

A visitor wearing a face mask walks by a piece of artwork by Andy Warhol during an exhibition at Tate Modern art gallery in London, Britain, Aug. 1, 2020. The Tate Modern, Tate Britain, Tate Liverpool and Tate St Ives art galleries reopened to the public. (Xinhua/Han Yan)

A visitor wearing a face mask walks by a piece of artwork by Andy Warhol during an exhibition at Tate Modern art gallery in London, Britain, Aug. 1, 2020. The Tate Modern, Tate Britain, Tate Liverpool and Tate St Ives art galleries reopened to the public. (Xinhua/Han Yan)

A visitor wearing a face mask walks by a piece of artwork by Andy Warhol during an exhibition at Tate Modern art gallery in London, Britain, Aug. 1, 2020. The Tate Modern, Tate Britain, Tate Liverpool and Tate St Ives art galleries reopened to the public. (Xinhua/Han Yan)