Grammar Note
castle 是可数名词，指具体建筑时常用单数或复数，如 a castle 或 castles。
城堡；要塞
castles — plural of castle
先理解核心含义，再看它在真实句子里的用法。
城堡；要塞
a large fortified building, especially a medieval residence of a king or nobleman
The old castle stands on top of the hill and is surrounded by a deep moat.
那座古老的城堡矗立在山顶上，四周环绕着一条深护城河。
一座大型住宅建筑或建筑群,设有防御工事,过去常由贵族或国王居住。也指具有中世纪城堡建筑特征的房屋或豪宅。
A large residential building or compound that is fortified and contains many defences; in previous ages often inhabited by a nobleman or king. Also, a house or mansion with some of the architectural features of medieval castles.
宏伟壮丽的宅邸。
a large and stately mansion
一次王车易位。
An instance of castling.
以前由统治者居住并设防以抵御攻击的大型建筑。
a large building formerly occupied by a ruler and fortified against attack
We took a guided tour of the castle and learned about the king who lived there in the 15th century.
我们参加了城堡的导览游，了解了15世纪居住在那里的国王。
Many castles in Europe were built to protect the people who lived inside.
欧洲许多城堡是为了保护住在里面的人而建造的。
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castle 是可数名词，指具体建筑时常用单数或复数，如 a castle 或 castles。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.