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| 拱上敞开的空间; 敞开的拱肩; 空腹式拱; 开腹拱桥 | |||
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open-spandrel : 22 phrases in 4 subjects |
| Architecture | 1 |
| Bridge construction | 10 |
| Metallurgy | 1 |
| Technology | 10 |
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