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| 拱顶封合; 隧道顶部合拢; 顶部合拢; 隧道顶部合拢; 拱圏合拢; 封顶 | |||
| top closing: 4 phrases in 3 subjects |
| Metallurgy | 2 |
| Rail transport | 1 |
| Textile industry | 1 |
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