A student gets her temperature checked in a primary school in Zunyi, southwest China's Guizhou Province, May 29, 2020. All primary schools in Guizhou Province resume classes. (Photo/China News Service)

Students study in classroom in a primary school in Zunyi, southwest China's Guizhou Province, May 29, 2020. All primary schools in Guizhou Province resume classes. (Photo/China News Service)

Students learn how to wash their hands correctly at a class in a primary school in Zunyi, southwest China's Guizhou Province, May 29, 2020. All primary schools in Guizhou Province resume classes. (Photo/China News Service)

Students study in classroom in a primary school in Zunyi, southwest China's Guizhou Province, May 29, 2020. All primary schools in Guizhou Province resume classes. (Photo/China News Service)

A teacher squeezes disinfecting hand sanitizer for students in a primary school in Zunyi, southwest China's Guizhou Province, May 29, 2020. All primary schools in Guizhou Province resume classes. (Photo/China News Service)