X-rays and chest films of both lungs are taken to understand the specific problems of the lungs, and the morphology is described in different ways, reflecting some of the problems. If there is a lung infection, there may be a diffuse patchy dense shadow at the lung lesion. If there is a pleural effusion, there may be a high external and low internal circumferential curvilinear shadow, which is the fluid plane of the effusion. If there is a fracture, a distinct fracture line may be seen. In addition, pneumothorax can be seen as an increase in transparency and permeability of the lung. The severity of the pneumothorax can be clarified by the size of the pneumothorax on the chest radiograph, if a dynamic chest radiograph is performed, it can be clearly seen that the respiratory motion of the lung is reduced. If there is an inhaled foreign body in the trachea, the extent and size of the foreign body can be seen, and the cause and severity of the lung disease can be clarified for early diagnosis and treatment.