名词
中文翻译：堡垒
同义词：
['bastion', 'fortress']
例句：
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1. The ancient city of Rome was a famous fortress during the Roman Empire.
古罗马城是罗马帝国时期的一个著名要塞。
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2. The fortress is well-fortified with walls and towers.
这个要塞被坚固的城墙和塔楼包围着。
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3. Fortresses are often used as military strongholds.
要塞通常用作军事要塞。