那就是拱顶石物种在生态系统中的作用。
拱顶石，正如我们原来猜想的一样。
其权利科学体系的拱顶石是先天自由。
拱顶石！它将引导我们走向我们最终的目标。
我们希望看到你们成为知识界的一块拱顶石。
We hope to see you become a keystone of the intellectual community.
拱顶石就在巴黎。
支拱板条专门用来在拱顶石放置好以前支撑拱的两边木架子。
A wooden frame built especially to support the sides of an arch until the keystone is positioned.
大师，四个人都证实了拱顶石--那个传奇的拱顶石的存在。
Teacher, all four confirmed the existence of the clef de vo?te… the legendary keystone.
拱顶石，塞缝石拱的中部楔形石头，使拱的各个部分连在一起。
The central wedge-shaped stone of an arch that locks its parts together.
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。
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.
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。
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.
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.
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.
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