capstone
US
UK capstone, copestone n: (top stone of a structure)
SC 压顶石 yā dǐng shí
TC 壓頂石
TC 壓頂石
SC 拱顶石 yā dǐng shí，gǒng dǐng shí
TC 拱頂石
TC 拱頂石
The placement of the capstone on the new town hall was celebrated in the community.
capstone n: figurative (crowning achievement) (比喻)
SC 成就的巅峰 chéng jiù de diān fēng
The novel about nuclear war became the capstone of the author's career.