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| 填缝石; 楔石 | |||
| 拱心石; 拱顶石 | |||
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| 拱顶心石; 填缝石; 嵌缝石 | |||
| 中心石; 拱顶石 | |||
| 冠石; 拱顶中心石 | |||
| key-stone: 2 phrases in 1 subject |
| Bridge construction | 2 |
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