Large tracts of grassy fields and forests in the area (light to dark green respectively) include nature preserves, grazing lands, and flood control areas.
此地区的大片绿地和植被(分别显示为浅绿和深绿色)包含了自然保护区域、牧地和防洪区。
2
How to forecast its flood with high precision always is a difficult problem, for large basins character of wide covering area and numerous branches.
大流域因其空间范围覆盖广、支流众多的特性，如何对其进行高精度的洪水预报一直是比较难的问题。
3
Sanmenxia storehouse district has brought a series of questions to the Shaanxi Guanzhong areaflood prevention security Because of vast sediment deposition, large scale river bed lifting.