a fortress of + noun
比喻用法，指能提供保护或隔绝外界的地方。
The remote cabin became his fortress of solitude.
那座偏远的小屋成了他独处的堡垒。
堡垒；要塞
fortresses — plural of fortress
（国际象棋的）堡垒局面；设防的地方；大型永久的防御工事,有时包括一个城镇；如堡垒、城堡；据点；防御或安全的地方；防御堡垒；如果被较弱的一方获得,将阻止对方渗透,通常实现和局的位置；城堡
a large, strong building or place that is protected against attack; a fortified defensive structure
设防的地方；大型永久的防御工事,有时包括一个城镇；如堡垒、城堡；据点；防御或安全的地方
A fortified place; a large and permanent fortification, sometimes including a town; for example a fort, a castle; a stronghold; a place of defense or security.
防御堡垒
a fortified defensive structure
如果被较弱的一方获得,将阻止对方渗透,通常实现和局的位置
A position that, if obtained by the weaker side, will prevent penetration by the opposing side, generally achieving a draw.
The ancient fortress stood on the hill, watching over the valley.
那座古老的防御堡垒矗立在山丘上，俯瞰着山谷。
用法提示：这里使用'fortress'作为主语，指代一座具体的防御建筑，体现了其坚固和守卫的意味。
During the war, the village turned their school into a fortress to protect themselves.
战争期间，村民们把学校改造成了一座防御堡垒来保护自己。
用法提示：此句中'fortress'作为宾语补足语，表示将学校变为防御设施，突出了其保护功能。
The castle had thick walls and towers, making it an impenetrable fortress.
那座城堡有厚实的墙壁和塔楼，使它成为一座难以攻破的防御堡垒。
用法提示：这里'fortress'作为表语，描述城堡的特征，强调其坚固和防御性。
比喻用法，指能提供保护或隔绝外界的地方。
The remote cabin became his fortress of solitude.
那座偏远的小屋成了他独处的堡垒。
against 后接需要防御的对象或威胁。
The mountain range served as a fortress against invaders.
这道山脉成了抵御入侵者的堡垒。
into 强调把某地改造成具有防御功能的地方。
They turned the old town into a fortress before the siege.
围城之前，他们把这座古镇变成了一座堡垒。
grammar · medium
易错句子He built fortress on the hill.
正确表达He built a fortress on the hill.
fortress 是可数名词,单数形式在句中作宾语时必须有限定词(这里用不定冠词 a)。中文名词前没有冠词,学习者容易漏掉,而英语可数名词单数不能“裸用”。
grammar · medium
易错句子The enemy captured three fortress last night.
正确表达The enemy captured three fortresses last night.
fortress 以 -s 结尾,复数要加 -es 变成 fortresses,而不是保持原形。中文名词没有数的词形变化,学习者常忘记英语可数名词在数词后必须用复数形式。
grammar · medium
易错句子They fortress the city against attack.
正确表达They fortified the city against attack.
fortress 只作名词,不能充当谓语动词;表示“设防、加固防御”这一动作要用动词 fortify。汉语中“堡垒”可作名词也可意译成动作,学习者容易把英语名词直接当动词使用。
中世纪堡垒
Tourists flock to the medieval fortress on the hill.
游客们纷纷涌向山上的中世纪堡垒。
坚不可摧的堡垒
The castle was long regarded as an impregnable fortress.
这座城堡长期以来被视为坚不可摧的堡垒。
围攻堡垒
The army besieged the fortress for three months.
军队围攻这座堡垒长达三个月。
攻占堡垒
The rebels finally managed to capture the fortress.
叛军最终成功攻占了这座堡垒。
山顶堡垒
A hilltop fortress once guarded the valley below.
一座山顶堡垒曾守卫着下方的山谷。
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Dictionary facts from ECDICT, WIKTIONARY.
堡垒的城墙
The fortress walls were three metres thick.
堡垒的城墙有三米厚。