the grassland degradation的用法和樣例：
例句
- Grassland degradation of Tongde County was caused by both natural factors and human factors.
同德縣的草地退化是自然因素和人為因素共同綜合作用的結果。 - Due to the unreasonable utilization, the eco-system of the grasslands has been damaged seriously and the deterioration area is keeping expanding.
由于不合理的利用，草原生態(tài)系統遭到了嚴重破壞，草地退化面積不斷擴大。
