Typical pneumonia is a lung infection, where the alveoli in the affected area fill up with exudates, blocking the oxygen transfer. Chest X-ray shows a clearly demarcated shadow.

• 典型肺炎是一种肺部感染；其感染部位的肺泡被浸润；氧气交换下降.；肺部X光照射呈现大片清晰的阴影