... 拱顶山 roof mountain 拱顶石 arcade key; arch apex; arch crown block; arch key stone; choke aggregate; crow ... 拱顶式 vaulted ...
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arch key stone
拱匙石
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The weight of the building is absorbed by the key stone in the centre of the arch, and distributed evenly over the entire span of the arch and then down into these two side pillars.
该建筑的重量是被在拱门中央的拱石顶所吸收，并且均匀的被分布在拱门的全跨度上，于是再下到这两边的柱子里。
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