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| 顶尖操作 | |||
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centre operation : 22 phrases in 9 subjects |
| Agriculture | 2 |
| Aviation | 2 |
| International trade | 1 |
| Management | 3 |
| Rail transport | 1 |
| Space | 5 |
| Sports | 3 |
| Technology | 3 |
| United Nations | 2 |
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