fortress/ˈfɔːtrəs/ n. 城堡；堡垒；要塞；设防的地方:

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例句/词组:

a fortress town enclosed by four miles of ramparts
由四英里长的城墙围着的设防城镇

英语解释：

a building or place that has been made stronger and protected against attack
• 城堡；堡垒；要塞；设防的地方: