X-disease

例句：

1. 1.The X-disease has been a major concern in recent years.
   X疾病近年来一直是主要关注点。
2. 2.Researchers are still trying to understand the exact cause of the X-disease.
   研究人员仍在试图理解X疾病的确切原因。
3. 3.Many people believe that the X-disease is caused by environmental factors.
   许多人认为X疾病是由环境因素引起的。