Boys play under a decorative light installation during a photocall for "Christmas at Kew" event at the Kew Gardens in London, Britain, Nov. 19, 2019. The "Christmas at Kew" light show will be held here from Nov. 20, 2019 to Jan. 5, 2020.

Boys look at light installations during a photocall for "Christmas at Kew" event at the Kew Gardens in London, Britain, Nov. 19, 2019. The "Christmas at Kew" light show will be held here from Nov. 20, 2019 to Jan. 5, 2020.

Girls look at light installations during a photocall for "Christmas at Kew" event at the Kew Gardens in London, Britain, Nov. 19, 2019. The "Christmas at Kew" light show will be held here from Nov. 20, 2019 to Jan. 5, 2020.

Boys admire light installations during a photocall for "Christmas at Kew" event at the Kew Gardens in London, Britain, Nov. 19, 2019. The "Christmas at Kew" light show will be held here from Nov. 20, 2019 to Jan. 5, 2020.

Photo taken on Nov. 19, 2019 shows the Christmas light displays during a photocall for "Christmas at Kew" event in front of the Palm House at Kew Gardens in London, Britain. The "Christmas at Kew" light show will be held here from Nov. 20, 2019 to Jan. 5, 2020. (Photos: Xinhua/Han Yan)

A visitor admires light installations during a photocall for "Christmas at Kew" event at the Kew Gardens in London, Britain, Nov. 19, 2019. The "Christmas at Kew" light show will be held here from Nov. 20, 2019 to Jan. 5, 2020.

Photo taken on Nov. 19, 2019 shows the Christmas light displays during a photocall for "Christmas at Kew" event in front of the Palm House at Kew Gardens in London, Britain. The "Christmas at Kew" light show will be held here from Nov. 20, 2019 to Jan. 5, 2020.

Photo taken on Nov. 19, 2019 shows the Christmas light displays during a photocall for "Christmas at Kew" event in front of the Palm House at Kew Gardens in London, Britain. The "Christmas at Kew" light show will be held here from Nov. 20, 2019 to Jan. 5, 2020.