bottom reflection
| active sonar system
| bottom reflection | |
| met. | 底反射; 底面反射 |
| oil | 海底反射 |
| active sonar system | |
| tech. | 主动声呐系统 |
| |||
| 底反射; 底面反射 | |||
| 海底反射 | |||
| ★ 海底声反射 | |||
|
bottom reflection : 7 phrases in 4 subjects |
| Geophysics | 1 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 3 |