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| 空心结构; 空间结构; 立体结构 | |||
| 空间结构物 | |||
| space structure: 40 phrases in 6 subjects |
| Aviation | 2 |
| Engineering geology | 1 |
| Metallurgy | 1 |
| Polymers | 1 |
| Space | 16 |
| Technology | 19 |
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