名词
中文翻译：要塞
同义词：
['bastion', 'fortification']
例句：
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1.The ancient city was a well-fortified fortress in the Middle Ages.
这个古城是中世纪一个坚固的堡垒。
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2.The soldiers were defending the fortress against an enemy attack.
士兵们正在保卫这座要塞抵御敌人的攻击。
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3.Fortresses are often used as symbols of power and strength.
堡垒常常作为权力和力量的象征。