 |
| |||
| irrigation by natural flow; natural-flow channel irrigation | |||
| gravity irrigation; irrigation by gravity | |||
| 自流灌溉: 2 phrases in 2 subjects |
| Earth sciences | 1 |
| Technology | 1 |
|
| |||
| irrigation by natural flow; natural-flow channel irrigation | |||
| gravity irrigation; irrigation by gravity | |||
| 自流灌溉: 2 phrases in 2 subjects |
| Earth sciences | 1 |
| Technology | 1 |