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hollow round
| pier
| hollow round | |
| met. | 中空圆坯; 空心圆坯 |
| pier | |
| hydroel.st. | 墩; 码头; 防波堤 |
| interntl.trade. | 防波堤栈桥; 码头; 防波堤 |
| met. | 支座 |
| |||
| 中空圆坯; 空心圆坯 | |||
| hollow round: 10 phrases in 3 subjects |
| Bridge construction | 1 |
| Metallurgy | 7 |
| Technology | 2 |
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