prolonged exposure

例句：

1. 1. The patient was exposed to the virus for several days before showing any symptoms.
   患者暴露于病毒数日后才出现任何症状。
2. 2.The researcher found that prolonged exposure to sunlight can have a positive impact on mental health.
   研究人员发现，长时间暴露在阳光下对心理健康有积极影响。
3. 3. The scientist conducted experiments to study the effects of prolonged exposure to high levels of radiation.
   科学家进行了实验以研究长时间暴露在高辐射水平下的影响。