 |
downgoing | travelling velocity
| travelling velocity | |
| tech. | 行进速度; 旅行速度 |
|
downgoing travelling velocity : 25 phrases in 6 subjects |
| Drilling | 1 |
| Engineering geology | 1 |
| Geophysics | 2 |
| Oil / petroleum | 19 |
| Technology | 1 |
| United Nations | 1 |