citadel

• 指城堡或堡垒，通常位于城市中或城市附近，用于防御和防护；也引申指坚固的据点或堡垒。

A noun referring to a fortress or stronghold, typically located in or near a city, designed for defense and protection.

1. B2formal

   A fortress or stronghold, typically on high ground, protecting or dominating a city.

   城堡

   • The ancient citadel overlooked the entire valley.
   • Soldiers defended the citadel from the invading army.
   • Tourists visited the ruins of the medieval citadel.

   同义词bastionbulwarkcastlefastnessfortfortificationfortresskeepredoubtstronghold

2. Symbol of strengthC1formal

   A place or institution that is a stronghold of a particular idea, belief, or system.

   堡垒

   • The university was a citadel of academic freedom.
   • The organization became a citadel of conservative values.
   • The library was a citadel of knowledge in the community.

   同义词bastionbulwarkfortressrampartstronghold