theart.那；这；这些；那些adv.（用于比较级前）更加；用于最高级前；(用于形容词、副词比较级前)越 ... 越 ...the sunny siden.向阳的一面(光明面；乐观的一面)

1. Grassland degradation of Tongde County was caused by both natural factors and human factors.
   同德县的草地退化是自然因素和人为因素共同综合作用的结果。
2. 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，草原生态系统遭到了严重破坏，草地退化面积不断扩大。