 |
| |||
| 下降水位 | |||
| falling water table: 4 phrases in 4 subjects |
| Bridge construction | 1 |
| Hydroelectric power stations | 1 |
| Refrigeration | 1 |
| Technology | 1 |
|
| |||
| 下降水位 | |||
| falling water table: 4 phrases in 4 subjects |
| Bridge construction | 1 |
| Hydroelectric power stations | 1 |
| Refrigeration | 1 |
| Technology | 1 |