a building or buildings built in order to defend an area against attack 要塞；堡垒；城堡 
the remains of a Roman fort 罗马要塞的遗址
Extra ExamplesTopics Historyc1, Buildingsc1The fort finally fell after a week of intense fighting. 经过一周的激战，堡垒最终被攻陷了。 The fort was under attack for three days. 要塞连续3 天受到袭击。 an Iron Age hill fort 铁器时代的山堡
Oxford Collocations Dictionaryadjective- hill
- border
- Iron Age
- …
- attack
- hold
- build
- …
- fall
- at a/the fort
- in a/the fort
- (North American English)
a place where soldiers live and have their training 兵营；军营；营地 Fort Drum 德拉姆堡
Oxford Collocations Dictionaryadjective- hill
- border
- Iron Age
- …
- attack
- hold
- build
- …
- fall
- at a/the fort
- in a/the fort
Word Originlate Middle English: from Old French fort or Italian forte, from Latin fortis ‘strong’.