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| space structure | |||
| hollow structure | |||
| hollow construction | |||
| hollow core construction | |||
| 空 心 结构: 17 phrases in 6 subjects |
| Agriculture | 1 |
| Bridge construction | 2 |
| Electric machinery | 1 |
| Plastics | 1 |
| Space | 1 |
| Technology | 11 |
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