防空 + Noun
防空 (fángkōng) means air defense, referring to military measures taken to protect against aerial attacks. It is commonly used as a modifier before nouns like 导弹 (missile) or 系统 (system) in military and news contexts.
这座城市部署了新的防空导弹系统。
Zhè zuò chéngshì bùshǔ le xīn de fángkōng dǎodàn xìtǒng.
This city has deployed a new air defense missile system.
防空警报突然响了起来。
Fángkōng jǐngbào tūrán xiǎng le qǐlái.
The air raid siren suddenly went off.
军队加强了边境地区的防空力量。
Jūnduì jiāqiáng le biānjìng dìqū de fángkōng lìliàng.
The military has strengthened air defense capabilities in the border areas.