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| 拱顶冠石 (stone) | |||
| 拱顶石 | |||
| 拱顶〔冠〕石 (stone) | |||
| 拱冠石; 龙口石; 拱石 | |||
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arch key : 4 phrases in 1 subject |
| Bridge construction | 4 |
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