自卫机能

例句：

1. 1. The soldier's self-defense mechanism was activated in the face of danger.
   士兵在面对危险时启动了自我防护机制。
2. 2. The machine has a self-protection function that prevents it from being damaged by external forces.
   这台机器具有自我保护功能，能够防止它受到外力的损害。
3. 3. The animal's instinctive self-defense mechanism is crucial for its survival.
   动物本能的自我防护机制对其生存至关重要。