Students run in the campus on their first day of the new semester at a primary school in southwest China's Chongqing, March 1, 2021. Students returned to school for the spring semester on Monday in many parts of China amid coordinated epidemic control efforts. [Photo/Xinhua]

Primary students wearing traditional costumes and ox-themed headpieces perform in class on their first day of the new semester at a primary school in Shenyang, northeast China's Liaoning Province, March 1, 2021. Students returned to school for the spring semester on Monday in many parts of China amid coordinated epidemic control efforts. [Photo/Xinhua]

Primary students wearing traditional costumes and ox-themed headpieces perform in class on their first day of the new semester at a primary school in Shenyang, northeast China's Liaoning Province, March 1, 2021. Students returned to school for the spring semester on Monday in many parts of China amid coordinated epidemic control efforts. [Photo/Xinhua]

Students wearing traditional costumes and ox-themed headpieces are seen in class on their first day of the new semester at a primary school in Shenyang, northeast China's Liaoning Province, March 1, 2021. Students returned to school for the spring semester on Monday in many parts of China amid coordinated epidemic control efforts. [Photo/Xinhua]

Students get their body temperature automatically checked before entering the Experimental High School Attached to Beijing Normal University in Beijing, capital of China, March 1, 2021. Middle school and primary school students returned to school as scheduled for the spring semester in Beijing on Monday amid coordinated epidemic control efforts. [Photo/Xinhua]

Students walk in the campus at the Experimental High school Attached to Beijing Normal University in Beijing, capital of China, March 1, 2021. Middle school and primary school students returned to school as scheduled for the spring semester in Beijing on Monday amid coordinated epidemic control efforts. [Photo/Xinhua]

A student shows a wish card she has received congratulating her on getting a chance to deliver a public speech at the national flag raising ceremony at the Experimental Primary School in Beilin District of Xi'an, northwest China's Shaanxi Province, March 1, 2021. Monday marks the first day of a new semester of middle schools and primary schools in Xi'an. Students at the Experimental Primary School in Beilin District were greeted by special wish cards from their teachers, promising them to realize one of their wishes in the new semester, including raising the national flag, having lunch with the headmaster, hugging one favorite teacher, skipping homework once and many others. [Photo/Xinhua]

Students show wish cards they have received at the Experimental Primary School in Beilin District of Xi'an, northwest China's Shaanxi Province, March 1, 2021. Monday marks the first day of a new semester of middle schools and primary schools in Xi'an. Students at the Experimental Primary School in Beilin District were greeted by special wish cards from their teachers, promising them to realize one of their wishes in the new semester, including raising the national flag, having lunch with the headmaster, hugging one favorite teacher, skipping homework once and many others. [Photo/Xinhua]

Students show wish cards they have received at the Experimental Primary School in Beilin District of Xi'an, northwest China's Shaanxi Province, March 1, 2021. Monday marks the first day of a new semester of middle schools and primary schools in Xi'an. Students at the Experimental Primary School in Beilin District were greeted by special wish cards from their teachers, promising them to realize one of their wishes in the new semester, including raising the national flag, having lunch with the headmaster, hugging one favorite teacher, skipping homework once and many others. [Photo/Xinhua]

Students show wish cards they have received at the Experimental Primary School in Beilin District of Xi'an, northwest China's Shaanxi Province, March 1, 2021. Monday marks the first day of a new semester of middle schools and primary schools in Xi'an. Students at the Experimental Primary School in Beilin District were greeted by special wish cards from their teachers, promising them to realize one of their wishes in the new semester, including raising the national flag, having lunch with the headmaster, hugging one favorite teacher, skipping homework once and many others. [Photo/Xinhua]