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| upper-lower class | |||
| 上下层: 35 phrases in 9 subjects |
| Agriculture | 4 |
| Architecture | 1 |
| Construction | 2 |
| Drilling | 4 |
| Electronics | 3 |
| General | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 16 |
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