1. 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。
2. 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。
3. The citadel at Besançon towered above the river. 贝桑松城堡高过河面。
4. The citadel was later converted into a bridewell to house the city's growing criminal population. 该城堡后来被改建成一个拘留所，以安置城市不断增长的犯罪人口。
