名词
中文翻译：堡垒
同义词：
['castle', 'stronghold', 'fortification例句：1. The ancient city of Rome was a fortress against the Romans.（古罗马城是对抗罗马人的坚固防御工事。）']
例句：
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1. The ancient city of Rome was a fortress against the Romans.
古罗马城是对抗罗马人的坚固防御工事。
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2. The castle was built as a fortress during the Middle Ages.
这座城堡在中世纪时期被建造为一座要塞。
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3. Fortresses are often used to describe strongholds or strong points in battle strategies.
要塞通常用来描述战斗策略中的坚固据点或关键点。