音标：['ki:stәun]
n. 拱顶石, 楔石, 重点
在线英汉词典

keystone的短语、例句：

keystone n 1 (architecture 建) central stone at the top of an arch locking the others into position 拱顶石. 2 (usu sing 通常作单数) (fig 比喻) most important part of a plan, an argument, etc on which all the other parts depend （计划、 论据等的）基础, 主旨
Belief in a life after death is the keystone of her religious faith. 她的宗教信仰的基础是相信死後有来生. Cf 参看 corner-stone (corner1).