1. He has been suffering from chronic back pain for years.
他多年来一直饱受慢性背痛的折磨。
2. Smoking is a major cause of chronic bronchitis.
吸烟是慢性支气管炎的主要原因之一。
3. Chronic unemployment is a serious issue in this region.
长期失业是该地区一个严重问题。