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| 金属结构骨架 | |||
| 轻钢龙骨; 金属框架 | |||
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metal frame : 17 phrases in 6 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| General | 1 |
| Space | 1 |
| Technology | 12 |
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