 |
| |||
| ground layer | |||
| substrate; substratum | |||
| C-horizon; subsoil stratum | |||
| |||
| pan | |||
| 底土层: 39 phrases in 9 subjects |
| Architecture | 4 |
| Bridge construction | 3 |
| Earth sciences | 1 |
| Engineering geology | 4 |
| General | 3 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 1 |
| Soil science | 1 |
| Technology | 20 |