Contestants show their robots during a competition for university students at Technology Fair 2022 in Helsinki, Finland on May 4, 2022. The event is held from May 3 to 5 at the Helsinki Fair Center. The theme of this year's event is "Solutions for a Sustainable Tomorrow".Photo:Xinhua

Contestants present a robot that can recognize human facial expressions during a competition for university students at Technology Fair 2022 in Helsinki, Finland on May 4, 2022Photo:Xinhua