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tunnel vault
archit. 筒形拱穹顶
hydroel.st. 隧洞顶拱
tech. 隧道穹顶; 隧道拱顶; 筒形屋顶; 圆筒拱顶; 筒形穹顶; 筒形拱顶
tunnel vault: 18 phrases in 2 subjects
Architecture2
Technology16

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