| |||
| 偶极声源 | |||
| 双源 | |||
|
double source : 18 phrases in 8 subjects |
| Astronomy | 1 |
| Electronics | 2 |
| General | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 5 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 4 |
| |||
| 偶极声源 | |||
| 双源 | |||
|
double source : 18 phrases in 8 subjects |
| Astronomy | 1 |
| Electronics | 2 |
| General | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 5 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 4 |