fortress sth
及物动词，后接被设防加固的地方或建筑。
The king fortressed the border town before the war.
战争爆发前，国王在边境小镇修筑了堡垒。
提供堡垒或防御工事；守卫,加强防御；筑要塞；以要塞防守
To furnish with a fortress or fortresses; to guard or fortify.
提供堡垒或防御工事；守卫,加强防御
To furnish with a fortress or with fortresses; to guard, to fortify.
一般现在时
They fortress the harbor against attack.
他们用堡垒加固港口以防袭击。
一般过去时
The villagers fortressed the hill during the war.
战争期间村民们在山上修筑了堡垒。
现在完成时
They have fortressed the coastline for centuries.
几个世纪以来，他们一直把海岸线设防加固。
规则动词，直接在词尾加 -s、-ed、-ing；第三人称单数 fortresses 因为原词以 s 结尾而多一个 e。
They fortressed the town against attack.
他们用堡垒加固了小镇，以抵御进攻。
用法提示：fortressed 是动词 fortress 的过去式，在此表示用堡垒加固或设防。
The ancient city fortresses its borders with high stone walls.
这座古城用高耸的石墙加固边界。
用法提示：fortresses 是动词 fortress 的第三人称单数形式，在此表示用堡垒加固边界。
Engineers are fortressing the coastal village before the storm season.
工程师们正在暴风雨季节来临前用防御工事加固这个沿海村庄。
用法提示：fortressing 是动词 fortress 的现在分词，在此表示正在用防御工事加固村庄。
及物动词，后接被设防加固的地方或建筑。
The king fortressed the border town before the war.
战争爆发前，国王在边境小镇修筑了堡垒。
多用被动语态，说明某地已被修筑防御工事。
The village was fortressed against raiders long ago.
很久以前，这个村庄就被设防加固以抵御劫掠者。
grammar · medium
易错句子The city was fortress by high walls.
正确表达The city was fortressed by high walls.
fortress 是及物动词，被动语态由 be + 过去分词构成，其过去分词为 fortressed；不能在 was 后直接用原形 fortress 充当分词。
grammar · medium
易错句子The village fortressed against the enemy for years.
正确表达The village was fortressed against the enemy for years.
fortress 意为“设防、加固防御”，是及物动词，主语是受保护的地点时应使用被动语态 be + fortressed，不能像汉语那样用主动式表达“被设防”。
grammar · medium
易错句子The general fortress the town every spring.
正确表达The general fortresses the town every spring.
主语 the general 为第三人称单数，一般现在时的谓语要用 fortresses（以 s 结尾的动词加 -es），不能与第一、二人称所用的 fortress 形式混用。
为城市修筑堡垒加强防御
The king fortressed the city before the enemy arrived.
国王在敌军到来前为这座城市修筑堡垒加强防御。
加固边境防御
They fortressed the border with a line of strongholds.
他们用一道要塞防线加固了边境。
防御工事坚固的
The town was heavily fortressed against any attack.
这座城镇防御工事坚固，足以抵御任何进攻。
设防以抵御进攻
The settlers fortressed against attack from the north.
定居者设防以抵御来自北方的进攻。
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