secondary level of prevention

例句：

1. 1. The hospital implemented a new policy to reduce the risk of secondary infection in patients.
   医院实施了一项新政策，以降低患者二次感染的风险。
2. 2. The doctor advised the patient to follow the recommended dietary changes for secondary prevention.
   医生建议患者遵循推荐的膳食变化，以进行二级预防。
3. 3. The research focused on the effectiveness of secondary prevention measures in preventing chronic diseases.
   研究关注于二级预防措施在预防慢性疾病中的效果。