Pictures taken on March 23 show the twelfth graders in Kunming No.1 Middle School took classes in the classroom.

On the same day, ninth and twelfth graders at other high schools across in Yunnan Province returned to the campus, following stringent preventive measures againt the on-going pandemic worldwide.

"The secondary schools that has met the requirements on the Covid-19 prevention and control can resumed classes for the ninth and twelfth graders on March 23," said a notice by Yunnan Provincial Department of Education.

Students in other grades of primary and secondary schools will return to school on March 23, while universities and vocational schools in Yunnan will reopen on days chosen by their own. 

Reporting by Jiang Wenyao (Xinhua); trans-editing by Wang Shixue