specific pathogen free program

例句：

1. 1. The hospital uses a specific pathogen freeprogram to prevent the spread of disease amongpatients.
   医院使用一个特定的病原体防护程序来防止患者之间的疾病传播。
2. 2. The vaccine isdesigned to provide SPF protection against certainviruses.
   这种疫苗旨在提供对某些病毒的SPF保护。
3. 3. The SPF rating indicateshow well the sunscreen protects againstUV rays.
   SPF评级表明防晒霜对紫外线的保护效果如何。