1. Endocarditis is an infection or inflammation of the inner lining of the heart chambers and valves.
心内膜炎是心脏腔室和瓣膜内衬的感染或炎症。
2. If left untreated, endocarditis can lead to serious complications and damage to the heart.
如果不加治疗，心内膜炎可能导致严重的并发症并对心脏造成损害。