a common disease; a common ailment

• 常见病

a common disease; a common ailment的用法和样例：

例句

1. Arthritis is a common complaint among the elderly.
   关节炎是老年人的一种常见病。
2. Avian influenza could become common in European flocks.
   禽流感可能成为欧洲禽鸟的常见病。