1·"That's where the keystone comes in," Langdon explained.
兰登解释说：“这就是楔石出现的原因。”
2·Thee keystone is an encoded stone that lies beneath the sign of the Rose.
楔石是一块放在玫瑰标记下的有编码的石头。
3·Especially an elongated boss (carved keystone) at the junction of the intersecting ribs of the fan vaulting associated with the English Perpendicular style.
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）。
1·That's what a keystone species does in an ecosystem.
那就是拱顶石物种在生态系统中的作用。
2·They cap the igloo by dropping a keystone, or block with edges cut wider above than below, into the remaining gap in the roof, and "grout" the gaps between blocks of snow with additional snow.
人们用拱顶石来盖顶，或者把雪块削切得上边缘比下边缘更宽，放进剩下的屋顶缺口里，再用雪来塞满雪块间的缝隙。
3·Each had told Silas the exact same thing-that the keystone was ingeniously hidden at a precise location inside one of Paris's ancient churches-the Eglise DE Saint-Sulpice.
每个人对塞拉斯所说都一模一样：拱顶石被巧妙地藏在一个巴黎古教堂——圣叙尔皮斯教堂内一个确切的地方。
1·Vogels (2003) claimed that the "XML document is the Web service's keystone because it contains all the application-specific information that a service consumer sends to the service for processing."
Vogels(2003)声称XML文档是Web服务的基础，因为它包含服务客户发送给服务处理的所有特定于应用程序的信息。
2·Today mathematics is the keystone of high technology, and, in a sense, the symbol of modern civilization.
而今天，数学则是高技术的基础，并且在一定意义上可以说是现代文明的标志。