沙漠化

They are learning a lot about them,but more and more land is becoming deserts all the time.

虽然他们正在对沙漠进行更多的了解，但是同时越来越多的土地正在沙漠化。

Why is more and more land becoming deserts?

为什么越来越多的土地正在沙漠化？

It is such a cycle that has led to widespread desertification in some parts of the world, primarily through overgrazing that can be compounded by naturally occurring droughts.

这样的循环导致在世界的某些地方大范围的人为沙漠化，这主要是由于过度放牧并伴随着自然干旱的发生。

Deserts have expanded to overtake previously vegetated areas, accelerated in some cases by overgrazing of domesticated animals.

沙漠已经扩大，侵占着先前的植被覆盖地区，在某些地区，由于过度放牧沙漠化的速度正在加快。

At present, the aeolian desertification is still facing the situation of "partly controlled but whole worsen".

目前我国沙漠化防治仍然面临着&局部治理，整体恶化&的严峻态势。

The control of wind erosion can maintain the fertility of farmland in arid and semi arid region.

可以采用保护性耕作技术防止农田沙漠化和提高作物产量。

Simulation of dust emission flux is very fundamental for evaluating climatic effects of dust aerosols and controlling desertification process and dust storm.

准确模拟粉尘释放通量对评价粉尘气溶胶的气候效应、沙漠化和沙尘暴防治具有重要意义。

Critical natural processes are analyzed systematically at the national scale, including headwater conservation, soil erosion prevention, storm water management and flood control, desertification combating and biodiversity conservation.

国土尺 度生态安全格局通过对江河源区水源涵养、洪水调蓄、沙漠化防治、水土保持和生物多样性保护5个维护生态安全最关键的自然过程进行系统分析评价而划定。

The corresponding geological, hydrogeological and professional models are set up by using the immersion sense, interaction with computer as well as realtime forecast function of VRT so that hydrogeological conditions, groundwater flow, groundwater quality , environmental geological problems such as land subsidence, sea water intrusion, soil desertification, soil salinizationalkalization, swampiness and the development tendency of cone of depression caused by groundwater exploitation, can be represented in the virtual environment.

利用虚拟现实技术沉浸感、与计算机的交互功能和实时表现功能，建立相关的地质、水文地质模型和专业模型，进而实现对含水层结构、地下水流、地下水质和环境地质问题（例如地面沉降、海水入侵、土壤沙漠化、盐渍化、沼泽化及区域降落漏斗扩展趋势）的虚拟表达。

Process of desertification has been increasing in residential areas, and 145 soums of Gobi region have been affected by sand movement in some way.

在人类居住区的沙漠化发生的更快，戈壁地区有145个苏木或多或少被沙尘移动。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。