 |
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| cumulative time | |||
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| accumulated time | |||
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| 累积时 间: 45 phrases in 14 subjects |
| Air defense | 2 |
| Artificial intelligence | 1 |
| Automobiles | 2 |
| Aviation | 3 |
| Business | 2 |
| Earth sciences | 1 |
| Electronics | 6 |
| General | 2 |
| Geophysics | 2 |
| Information technology | 1 |
| Metallurgy | 3 |
| Space | 6 |
| Technology | 9 |
| Telecommunications | 5 |