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划 清 : 18 phrases in 10 subjects |
| Aviation | 3 |
| Business | 2 |
| Corporate governance | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Economy | 3 |
| Environment | 1 |
| General | 3 |
| Technology | 2 |
| United Nations | 1 |
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