key joint
... wedge gauge 楔规 wedge gap 楔形缝,楔形间隙 wedge block 楔块 ...
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楔形狭缝 tapered slit
楔形接缝 [木] splayed jointing
楔形工作缝 keyed construction joint
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.
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