citadel
n. 城堡；大本营；避难处
复数 citadels
例句
The business is no longer regarded as a citadel of commerce.
这个生意已经不再被看作是商业堡垒了。
《柯林斯英汉双解大词典》
It towered above the older buildings like a citadel, which indeed it was, the outpost of a new age, perhaps a new civilization, perhaps a new barbarism.
它屹立在古老的建筑之上，像一座城堡，也的确是一个新时代的前哨，这种前哨可能意味着一种新文明，也可能是一种新野蛮。
The citadel at Besançon towered above the river.
贝桑松城堡高过河面。
