兰登解释说：“这就是楔石出现的原因。”
楔石是一块放在玫瑰标记下的有编码的石头。
Thee keystone is an encoded stone that lies beneath the sign of the Rose.
把楔石据为已有。
可是，紫檀木盒里的这个石筒显然跟一般的楔石不太一样。
Keystones had always had atradition of secrecy. And yet, the stone cylinder in the rosewood box was obviously somethingquite different.
尤其是指与英国垂直式风格有关的一种扇形拱顶的交叉拱肋在接合点的拉长浮凸饰（雕刻的楔石）。
Especially an elongated boss (carved keystone) at the junction of the intersecting ribs of the fan vaulting associated with the English Perpendicular style.
卡普和我在他博物馆的楔石间慢步，卡普驼着背，情绪热切，饱经风霜的脸旁挂着一缕灰色的刘海，整个人似乎让活力和自豪撑了起来。
Shuffling among his museum's keystones, Karp, a stooped, intense man whose weathered head is ornamented with a fringe of gray hair, seemed to swell with vigor and pride.
石匠们用楔口连接法将楣石水平放置，将石块连接起来，然后将这些直立的石块和楣石用球窝接头或楔口接头来固定。
They made joints in stone keeping the lintels in place horizontally using a tongue and groove joint and subsequently fixing the upright and lintel with a ball and socket joint or mortice and tenon.
石匠们用楔口连接法将楣石水平放置，将石块连接起来，然后将这些直立的石块和楣石用球窝接头或楔口接头来固定。
They made joints in stone keeping the lintels in place horizontally using a tongue and groove joint and subsequently fixing the upright and lintel with a ball and socket joint or mortice and tenon.
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