preservative reflex

例句：

1. 1. The preservative reflex in the brain helps to protect against disease.
   大脑中的防腐剂反应有助于防止疾病。
2. 2. The chemical preservative reflex is a natural defense mechanism.
   化学防腐剂反应是一种自然防御机制。
3. 3.The preservative reflex can be triggered by stress or trauma.
   防腐剂反应可以被压力或创伤触发。