 |
| |||
| 难以通行的地形 | |||
| 难以掘进的地段 | |||
| 难于通行的地带; 危险悬帮 | |||
|
heavy ground : 7 phrases in 5 subjects |
| Air defense | 1 |
| Business | 1 |
| Electronics | 3 |
| Space | 1 |
| Telecommunications | 1 |
|
| |||
| 难以通行的地形 | |||
| 难以掘进的地段 | |||
| 难于通行的地带; 危险悬帮 | |||
|
heavy ground : 7 phrases in 5 subjects |
| Air defense | 1 |
| Business | 1 |
| Electronics | 3 |
| Space | 1 |
| Telecommunications | 1 |