 |
| |||
| hour of observation | |||
| 观察时: 23 phrases in 12 subjects |
| Agriculture | 4 |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 2 |
| Business | 2 |
| Economy | 1 |
| Information technology | 1 |
| Management | 1 |
| Mathematics | 1 |
| Securities | 1 |
| Space | 1 |
| Technology | 7 |
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