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| 拱圈块; 楔形拱面石 | |||
| 拱圈〔旋〕 块 | |||
| 拱块; 拱面石 | |||
| 拱面石 (楔形); 拱旋块 | |||
| 拱楔块; 楔形拱石; 拱圈砌块; 拱圈块; 拱圈; 楔形的拱面石; 木拱楔块 | |||
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arch block : 4 phrases in 2 subjects |
| Metallurgy | 1 |
| Technology | 3 |
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