中心拱 center arch
拱圈中心 arch center
中间隆起的拱形 vault ; dome
拱中心角 central angle of arch
等中心角拱坝 constant central angle arch dam
中承式拱桥 half-through arch bridge ; mid-supported arch bridge
足中段拱形 Mid Foot Arch
变中心拱坝 variable center arch dam
起拱中心 center of springing
拱的中央点 CENTER - the center point of the arch
建筑学中，拱道或门口的拱心石，是把建筑整体连接在一起来防止它倒塌的石头。
In architecture, a keystone in an archway or doorway is the stone that holds the whole thing together, and keeps it from collapsing.
计划中的大号拱心石石油管道将用于运输产自加拿大油沙的重原油。
The proposed Keystone XL pipeline would carry heavier crude oil produced from tar sands in Canada.
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