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| 平衡系统 | |||
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equilibrium system : 14 phrases in 8 subjects |
| Aviation | 1 |
| Business | 2 |
| Economy | 1 |
| Electric machinery | 1 |
| Geology | 1 |
| Metallurgy | 2 |
| Rail transport | 1 |
| Technology | 5 |
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