It's an online class. According to the information of epidemic prevention and control in Changsha, Changsha University of Science and Technology is taking classes online. University of Science and Technology refers to the abbreviation or nickname of the University of Science and Technology, and some refer to the names of residents or other personnel around the University of Science and Technology. It is also a vast field, including physics, chemistry, biology, engineering, astronomy, mathematics and various applications and combinations of the previous six categories, a big combination.