secondary level of prevention的用法和樣例：
例句
- METHODS Three-grade prevention strategy was introduced into control of nosocomial infection.
方法將三級預防策略應用在醫院感染控制中。 - Tertiary prevention is by the treatment of cases or carriers so that they do not spread the organism any further.
三級預防的實現是通過治療患者和病原攜帶者，從而使他們不再傳播病原體。
