名词
中文翻译：要塞工事
同义词：
['fortifications', 'fortresses', 'works of art', 'defense works']
例句：
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1. The ancientcity was surrounded by a series of fortifications that protected it from invaders.
这个古老的城市被一系列防御工事包围，保护它免受入侵者的侵害。
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2.The engineers designed the fortresses to withstand enemy attacks.
工程师们设计了这些堡垒来抵御敌人的攻击。
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3.The works of art are considered masterpieces of their time and have been preserved as cultural heritage.
这些艺术作品被认为是其时代的杰作，并作为文化遗产被保存下来。