cornerstone

名词 cornerstone:

1. the fundamental assumptions from which something is begun or developed or calculated or explained
   同义词：basis, base, foundation, fundament, groundwork
2. a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies
3. a stone at the outer corner of two intersecting masonry walls

cornerstone 也作 corner stone

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：
例句：
the cornerstone of an argument.
争论的基础