Network problems. Yulin is a prefecture-level city under Shaanxi Province. It is located in the northernmost part of Shaanxi, in the northern Shaanxi and Hetao areas, at the junction of the Loess Plateau and the Mu Us Sandy Land. It is a transitional zone between the Loess Plateau and the Inner Mongolia Plateau. The network system of epidemic prevention and control education in this area cannot be accessed due to network problems. You can check the network and re-enter it.