arch stone的用法和樣例：
例句
- An arch with mutually supporting voussoirs that has a straight horizontal extrados and intrados.
有水平拱背和水平的內弧面的互相支撐的拱石的拱。 - I felt the stone of the archway and believed that it symbolized the noble, the strong and the masculine -- a fist and a towering exclamation mark!
我撫摸著(zhù)北拱石，我以為這塊石頭是高貴的，堅強的，是一個(gè)陽(yáng)具，是一個(gè)拳頭，是一個(gè)沖天的驚嘆號。
