 |
| |||
| simple system | |||
| 单一 系统: 20 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Business | 3 |
| Economy | 1 |
| Electronics | 5 |
| General | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 4 |
| United States | 1 |
|
| |||
| simple system | |||
| 单一 系统: 20 phrases in 10 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Business | 3 |
| Economy | 1 |
| Electronics | 5 |
| General | 1 |
| Oil / petroleum | 1 |
| Space | 1 |
| Technology | 4 |
| United States | 1 |