a fortified + noun
作定语，直接修饰名词，说明该事物有防御工事或已被加固。
The soldiers defended the fortified town.
士兵们保卫着这座设防的城镇。
设防的；有防御工事的
强化的；增强了…的；用堡垒或防御工事加固的；强化了的；增强了强度的；加强的
protected by walls or other defensive structures
用堡垒或防御工事加固的
secured with bastions or fortifications
强化了的；增强了强度的
having something added to increase the strength
The fortified milk contains extra vitamin D for stronger bones.
强化牛奶含有额外的维生素D，有助于骨骼更强壮。
用法提示：这里'fortified'是形容词，修饰'milk'，表示添加了营养成分。
The ancient castle was fortified with thick stone walls to resist attacks.
这座古老的城堡用厚厚的石墙加固，以抵御攻击。
用法提示：这里'fortified'是形容词，修饰'castle'，表示结构上加固。
Many breakfast cereals are fortified with iron and B vitamins.
许多早餐麦片强化了铁和B族维生素。
用法提示：这里'fortified'是形容词，描述麦片中添加了营养素。
作定语，直接修饰名词，说明该事物有防御工事或已被加固。
The soldiers defended the fortified town.
士兵们保卫着这座设防的城镇。
with 后接添加进去以增强效果的成分，多用于食品、饮料。
This orange juice is fortified with vitamin C.
这款橙汁强化了维生素C。
against 后接所要防御或抵挡的对象。
The walls were fortified against attack.
这些城墙被加固以抵御攻击。
用 heavily、strongly 等副词修饰，强调设防或加固的程度。
The border region is heavily fortified.
边境地区戒备森严。
grammar · medium
易错句子The milk is fortify with vitamin D.
正确表达The milk is fortified with vitamin D.
be 动词后面作表语要用过去分词形式的形容词 fortified，表示“被强化了的”这一状态；fortify 是动词原形，不能直接跟在 is 后面。
grammar · medium
易错句子They plan to fortified the city walls.
正确表达They plan to fortify the city walls.
不定式 to 后面必须接动词原形 fortify；fortified 是过去式/过去分词或形容词，不能用在 to 之后。此处需要的是动词，所以用原形。
grammar · medium
易错句子This is a fortified with vitamins drink.
正确表达This is a drink fortified with vitamins.
英语中带 with 的补充成分要放在被修饰名词之后作后置修饰，fortified with vitamins 整体后置修饰 drink；不能像汉语那样把整个修饰短语放在名词前面。
reinforced 指加入材料使其更坚固（如 reinforced concrete 钢筋混凝土），强调的是物理加固，不表示“设防”；fortified 则既可指用堡垒、防御工事设防（a fortified city），也可指添加营养成分来增强（fortified cereal）。
strengthened 泛指让力量、程度或关系变强，用法笼统，可指人、物或抽象事物；fortified 特指修建防御工事设防，或添加某物以提高强度、营养，语义更具体。
forfeited 意为因违约、受罚而失去财产或权利，拼写和读音与 fortified 接近但意义无关；描述军事设防或添加营养成分时只能用 fortified，不能替换为 forfeited。
fort + -ify
fortific- + -ation
un- + fortified
fortify + -ing
fortified + wine
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