Artists perform at the rehearsal of "Echoes of Eternity", a contemporary ballet by Shanghai Ballet, during the Chekhov International Theater Festival in Moscow, Russia, on May 15, 2019. "Echoes of Eternity", adapted from Bai Juyi's ancient Chinese poem "Everlasting Regret", is put on stage by Shanghai Ballet with choreographer Patrick de Bana during the Chekhov International Theater Festival, which kicked off in Moscow on Wednesday. (Xinhua/Evgeny Sinitsyn)