1. An infectious febrile disease of cattle, caused by a mycoplasma and characterized by inflammation of the pleura and lungs. 
   牛胸膜肺炎由支原菌引起的牛传染性发烧的炎症，症状为胸膜和肺部发炎
2. Any of numerous bacteria of the genus Spiroplasma that vary in form, lack flagella, and are associated with various plant diseases. These bacteria and the related mycoplasma are the only bacteria without cell walls. 
   螺原体螺原体属中许多种细菌中任一种，外形可变且缺少鞭毛，与各种植物疾病相关。这类细菌和相关的支原菌是唯一的无细胞壁的菌类
3. Any of numerous parasitic, pathogenic microorganisms of the genus Mycoplasma that lack a true cell wall, are gram-negative, and need sterols such as cholesterol for growth. In human beings, one species is a primary cause of nonbacterial pneumonia. 
   支原体属支原体属大量寄生的、致病的微生物，它们没有真正的细胞壁，呈格兰氏阴性并且生长时需要类固醇（比如胆固醇）。在人体中，有一种是无菌肺炎产生的主要原因

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