肺脏是一个与外界相通的器官，又是体内血液循环的必经之路。所以，体内外各种致病因素，都可以引起肺部多种多样的炎症变化。肺炎是常见病，种类繁多。在人的一生中，几乎都会罹患一种或多种的肺炎。有的时候，你一不小心着凉或连续几天劳累，或者因其他疾病住在医院，肺炎就 The lungs are an organ that communicates with the outside world and is the only path through which blood circulates in the body. Therefore, a variety of pathogenic factors in vitro and in vivo, can cause a variety of inflammatory changes in the lungs. Pneumonia is a common disease, a wide range. Almost all people have one or more types of pneumonia during their lifetime. Sometimes, you accidentally catch cold or tired for a few days, or other diseases in the hospital, pneumonia