堡垒 bǎolěi fort
怎么记住“堡垒”: 堡 fort + 垒 rampart = fort.
汉字
用法
- A fortress / stronghold - 攻克堡垒 (gōngkè bǎolěi) storm a fortress; figuratively 科学堡垒 (kēxué bǎolěi) a bastion to conquer.
- Often figurative for a hard problem or entrenched position to overcome. Written.