Citizens enjoy rock climbing during the Open Day in cerebration of the 40th anniversary of the University of Macau in Macao, south China, Jan. 17, 2021. (Photos: Xinhua)

People visit the University of Macau during the Open Day in cerebration of the 40th anniversary of the university in Macao, south China, Jan. 17, 2021.

People pose for a photo during the Open Day in cerebration of the 40th anniversary of the University of Macau in Macao, south China, Jan. 17, 2021.

People pose for a photo during the Open Day in cerebration of the 40th anniversary of the University of Macau in Macao, south China, Jan. 17, 2021.

Students perform during the opening ceremony for the Celebration of the 40th Anniversary of the University of Macau and Open Day in Macao, south China, Jan. 17, 2021.

Song Yonghua, rector of the University of Macau, speaks during the opening ceremony for the Celebration of the 40th Anniversary of the University of Macau and Open Day in Macao, south China, Jan. 17, 2021.

Young people visit the exhibition center of a lab in the University of Macau during the Open Day in cerebration of the 40th anniversary of the university in Macao, south China, Jan. 17, 2021.

Young people visit the exhibition center of a lab in the University of Macau during the Open Day in cerebration of the 40th anniversary of the university in Macao, south China, Jan. 17, 2021.