defense behavior

例句：

1. 1. The animal's defense behavior is a natural response to danger.
   动物的防御行为是对危险的自然反应。
2. 2.In the face of threats, humans exhibit defensive behaviors that are often instinctual.
   面对威胁时，人类表现出往往是本能的防御行为。
3. 3. Researchers have observed that some species use defense behaviors to deter predators.
   研究人员观察到，有些物种使用防御行为来阻止捕食者。