Photo taken on March 30, 2020 shows an infrared temperature detector used in a senior high school in Yixing, east China's Jiangsu Province. In eastern China's Jiangsu Province, students of grade 9 and 12 returned to school to prepare for entrance exams for senior high schools and colleges, respectively, after a long winter break, according to the provincial education department. (Photo by Ding Huanxin/Xinhua)
