 |
| |||
| land erosion control; soil conservation | |||
| |||
| soil conservancy; conservation of soil | |||
| soil conservation | |||
|
предотвращение эрозии почвы : 2 短语, 2 学科 |
| 生态 | 1 |
| 马卡罗夫 | 1 |
|
| |||
| land erosion control; soil conservation | |||
| |||
| soil conservancy; conservation of soil | |||
| soil conservation | |||
|
предотвращение эрозии почвы : 2 短语, 2 学科 |
| 生态 | 1 |
| 马卡罗夫 | 1 |