Actual condition makes clear, natural meadowy have a lot of change with sanded ground.

实际情况表明，天然牧草地和沙地都有很多变化。

Accordingly, we raised the 3rd level kind, for example 2 class kind natural meadowy differentiate in the 3rd class for natural meadowy and degrade natural meadowy two group.

因此，我们增加了第三级类，例如将二级类的天然牧草地在第三级划分为天然牧草地和退化天然牧草地两个小类。