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cornerstone 也作 corner stone AHD[kôrʹnər-stōn'] D.J.[ˈkɔːnəˌstəʊn]K.K.[ˈkɔrnɚˌston]n.（名词）- A stone at the corner of a building uniting two intersecting walls; a quoin.墙角石：用于联结一个建筑中两个相交的墙壁的角落处的石头；角石
- Such a stone, often inscribed, laid at a ceremony marking the origin of a building.奠基石：在建筑物动工的仪式上设置的一种铭刻有字的石头
- An indispensable and fundamental basis:不可分割且根本性的基础：the cornerstone of an argument.争论的基础
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