The lung tissues include the left and right lungs, both of which have lobes and lobules, and the difference between the two is as follows: the left lung has oblique fissures, which can be divided into two lobes, the upper and lower, and the right lung has horizontal and oblique fissures, which divide the right lung into three lobes, the upper, middle and lower, for a total of five lobes collectively referred to as the lobes of lung tissue; the lobules are generally composed of relatively thin bronchial connections, branches and alveoli at the terminal end, and the lobules are The lobules are the basic structural units that make up the lung tissue. In clinical practice, the physiological anatomy allows the classification of different focal lung infections into lobar pneumonia, which most often occurs in young adults, and lobar pneumonia, which most often occurs in children under two years of age.