1, Lung field mass 2, Obstructive pneumonia and pulmonary atelectasis 3, Hemoptysis or sputum blood 4, Lung hilar shadow enlarged mass shadow 5, Chronic cough 6, Diffuse lung lesions 7, Tracheal and bronchial foreign body 8, Large amount of secretion in the respiratory tract that is difficult to cough up 9, Septic inflammation of bronchial tubes 10, Diagnosis of the pathogenesis of infectious lung diseases