Elaine暖阳
arch在狭义上是拱门，约等于一个二维的结构。举个例子，凯旋门的英文是triumphal arch，由此可以知道这里arch用来形容的是“门”，一个二维的结构。可以同时参考一下英文释义：a curved symmetrical structure spanning an opening and typically supporting the weight of a bridge, roof, or wall above it. • an arched structure forming a passageway or a ceremonial monument: a triumphal arch. • a shape resembling an arch or a thing with such a shape: the delicate arch of his eyebrows. • the inner side of the foot.vault表示三维的拱顶，是多个arch在不同二维平面组成的三维结构。英文释义见：1 a roof in the form of an arch or a series of arches, typical of churches and other large, formal buildings. • literary a thing resembling an arched roof, especially the sky: the vault of heaven. • Anatomy the arched roof of a cavity, especially that of the skull: the cranial vault.个人觉得这二者的关系近似中国古建筑中的椽、檩、梁、枋与整个屋顶的关系。
