People hold bunches of flowers to wait for students attending a graduation ceremony outside Riga Stradins University in Riga, Latvia, on June 29, 2021.(Photo: Xinhua)

Students participate in a graduation ceremony at Riga Stradins University in Riga, Latvia, on June 29, 2021.(Photo: Xinhua)

Students embrace each other during a graduation ceremony at Riga Stradins University in Riga, Latvia, on June 29, 2021. (Photo: Xinhua)

Students throw their mortarboards in the air during a graduation ceremony at Riga Stradins University in Riga, Latvia, on June 29, 2021.(Photo: Xinhua)