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.
犹如弯弓的单拱，在与人行通道连接之处是非常之薄，在向地面延伸的过程中逐渐变厚。
The bowed arches of the single-span design are dramatically thin where they connect with the walkway, but they flare out as they approach the ground.
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