 |
| 周期时间: 59 phrases in 17 subjects |
| Air defense | 2 |
| Artificial intelligence | 2 |
| Automobiles | 1 |
| Aviation | 7 |
| Business | 2 |
| Commerce | 3 |
| Earth sciences | 1 |
| Electronics | 11 |
| General | 1 |
| Genetics | 1 |
| Information technology | 7 |
| International trade | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 2 |
| Plastics | 4 |
| Technology | 10 |
| Wind Energy | 1 |