peripheral air defense

例句：

1. 1. The peripherial air defense system is designed to protectthe city from natural disasters.
   外围空气防御系统旨在保护城市免受自然灾害的侵害。
2. 2.The government has implemented a new policy toenhance the peripherial air defensecapabilities.
   政府已实施新政策以增强外围空气防御能力。
3. 3. The peripherialair defense system is crucial for maintaining publicsafety during emergencies.
   外围空气防御系统在紧急情况下对维护公共安全至关重要。