cope·stone /ˈkopˌston/
牆帽,冠石,最後的完成工作
Cope·stone n. Arch. A stone for coping. See Coping.
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copestone
n 1: a final touch; a crowning achievement; a culmination [syn: finishing
touch, capstone]
2: a stone that forms the top of wall or building [syn: capstone,
coping stone, stretcher]