1. 名詞
   大本營, 根據地
   避難所
   居高臨下的: 城堡, 城寨/
   要塞
   裝甲區
   密閉區
   極度排外的圈子
   /此名詞複數為"citadels"/
   

   同義字詞
   bastion,castle,fastness,fort,fortification,fortress,hold,redoubt,stronghold
   

例句

1. Today, the citadel has 12 towers.
2. This is called the " Citadel of Poseidon".
3. It is also located close to the Citadel fort.
4. Guards of the Citadel manned the Seventh Gate.
5. The Citadel was where nuclear warheads were made.
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