fortress

n. /ˈfɔːrtrəs/ B2

堡垒；大型要塞

A large strong building or group of buildings that can be defended.

仙境例句

The Mouse described a stone fortress with walls so high that no army could climb them.

老鼠讲到一座石头要塞，城墙高得没有哪支军队爬得上去。