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连续工作小时 : 13 phrases in 10 subjects |
| Business | 3 |
| Commerce | 2 |
| Drilling | 1 |
| Economy | 1 |
| Exhibitions | 1 |
| International trade | 1 |
| Logistics | 1 |
| Management | 1 |
| Project management | 1 |
| Technology | 1 |
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