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| 封闭的多边形; 闭合环 (路); 闭合多边形; 封闭多边形; 闭锁多边形 | |||
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closed polygon : 7 phrases in 5 subjects |
| Bridge construction | 1 |
| Electronics | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Technology | 3 |
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