polymyositis

例句：

1. 1.She was diagnosed with polymyositis and had to stop her work.
   她被诊断出患有多发性肌炎，不得不停止工作。
2. 2. The patient's condition worsened after receiving treatment for polymyositis.
   这位患者的病情在治疗多发性肌炎后有所恶化。
3. 3.Polymyositis is a chronic autoimmune disease that affects the muscles.
   多发性肌炎是一种慢性自身免疫性疾病，影响肌肉。