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| 弧拱; 圆拱; 圆弧拱 | |||
| 圆〔弧〕拱 | |||
| 圆弧拱 | |||
| 圆弧拱 | |||
| 弧形券; 圆券 | |||
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circular arch : 18 phrases in 3 subjects |
| Bridge construction | 1 |
| Hydroelectric power stations | 2 |
| Technology | 15 |
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