The Tokyo 2020 Olympic medals are seen during the "One Year to Go" ceremony celebrating one year to the start of the Tokyo 2020 Olympics Games in Tokyo, Japan, on Wednesday. (Photo: Xinhua)

Eighteen giant panda cubs born in 2018 had a birthday party Thursday at the Shenshuping base. All the 18 cubs are to turn one year old between June and September. Most of them were born at the base under the China Conservation and Research Center for the Giant Panda. (Photo: Xinhua)

Indonesian soldiers try to extinguish peatland fire at Payung Sekaki, Pekanbaru, Riau, Indonesia on Monday. (Photo: VCG)

People participate in public boxing practice in Moscow, Russia, on Monday. (Photo: Xinhua)

People of Yi ethnic group dance during the torch festival in Butuo County of Liangshan Yi Autonomous Prefecture, southwest China's Sichuan Province on Tuesday. (Photo: Xinhua)

Theresa May leaves with her husband after giving a farewell speech outside 10 Downing Street in London, Britain on Wednesday. Newly-elected Conservative Party leader Boris Johnson took office as the British prime minister on Wednesday amid the rising uncertainties of Brexit. (Photo: Xinhua)

A girl poses for a photo with the Eiffel Tower in the backdrop by a fountain at the Trocadero Place in Paris, France. Temperatures in Paris hit 42 degrees centigrade on Thursday. (Photo: Xinhua)

The three women's world championships 100-meter butterfly medalists on Monday staged a touching show of support for star Japanese swimmer Rikako Ikee in her battle with leukemia. (Photo: VCG)

Herdsmen demonstrate horse lassoing in West Ujimqin Banner, north China's Inner Mongolia Autonomous Region on Wednesday. (Photo: VCG)

The Washington Monument was lit up to look like a rocket for the "Apollo 50: Go for the Moon" show held on Friday to celebrate the 50th anniversary of the Apollo 11 mission in Washington, DC, US (Photo: VCG)