名词
中文翻译：民用防空工程
同义词：
['civil defense works', 'civil air defense system']
例句：
-
1. The civil air defence works are designed to protect against enemy aircraft.
民用防空工程旨在保护免受敌方飞机的攻击。
-
2.The civil air defence works have been upgraded to improve their effectiveness.
民用防空工程已经升级，以提高其有效性。
-
3. The civil air defence works play a crucial role in national security.
民用防空工程在国家安全中起着至关重要的作用。