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匹兹堡 : 21 phrases in 13 subjects |
| Artificial intelligence | 1 |
| Baseball | 1 |
| Commerce | 2 |
| Company name | 1 |
| Computers | 1 |
| Earth sciences | 3 |
| Finances | 1 |
| General | 5 |
| Geography | 1 |
| Geology | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 1 |
| Technology | 2 |
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