水土

The Forestation Project in China had been implementing since 1999 and it aimed to control soil and water erosion.

以控制水土流失为主要目的的退耕还林工程是近年来我国政府启动的一项超大型生态建设项目。

With every timber cut, a plan is made by trained foresters to protect the watershed, ensure regeneration, and maintain or increase biodiversity.

每年的木材砍伐计划，都是由训练有素的专门负责人制定，要保证保持水土，确保再生，并保持或增加生物多样性。

Based on the Biot s two-phase theory for fluid-saturated porous media, considering the inertia force of the solid and the liquid, and the coupling function between the solid and the liquid, and the compressibility of the liquid in allusion to the character of the nearly saturated soils. The dynamic governing differential equations are solved by Hankel transform. Then, considering the boundary condition, the dual integral equations of vertical vibration are established which are reduced to Fredholm integral equation of the second kind.

本文基于Biot两相介质动力固结理论，针对准饱和土地基的特点，考虑了流体的可压缩性，土体和流体的惯性及水土之间的耦合作用，运用Hankel变换技术求解动力控制方程，然后按混合边值条件建立起对偶积分方程，并将其化为易于数值计算的第二类Fredholm积分方程，分别研究了准饱和土半空间地基、上覆单相弹性层的准饱和土地基和准饱和粘弹性地基上刚性基础的竖向振动特性。

When we dump garbage in the drains that are built by government we simply aggravate the problem of erosion.

当我们倾倒的，由政府兴建，我们只是加剧了水土流失问题水渠的垃圾。

And water and soil loss is lied on the first stage,i.e.,the erosion process of geomorphology development.

水土流失目前主要是指第一阶段即地貌发育的侵蚀过程。

A preliminary study on laws of soil and water losses in gneiss, which is the main type of rocks in Taihang, was carried out in this paper on the bases of examination data, survey of flood and historic statistic data.

根据试验观测数据和洪水灾害考察结果，结合历史统计资料，对河北太行山的主要类型岩石－片麻岩低山区的水土流失特点进行了初步研究。

The Poa pratensis is graminaceous rhizome needle grass,its rhizome are very stronger,the nutrition value is very higher.Now it is used as grass seed to conserve water and soil,graze and mow grassland and degraded grassland restoration.

草地早熟禾为禾本科多年生根茎下繁草，根茎发达，营养价值丰富，常被作为水土保持草种、放牧及刈割草场草种、草地退化恢复的先锋草种。

Vetiver zizanioides is a perennial grass of the Poaceae family, known as silage, soil and water conservation role.

香根草是一种多年生禾本科草本植物，具有极强的生态适应性和抗逆能力，可作饲料和水土保持用。

This article introduces the advan- tages of a four-layer mat for cultivating greensward from the principle of selecting material,the structure of the mat ,process- ing method and its functions,and analyzes its effects on the growth of grass and the control of soil loss.

文章介绍了4层式草皮培育垫材料的选用原则、结构、加工方法及其作用，分析了其对草的生长、水土流失控制的作用以及生产成本等方面的情况。

Water and soil loss ; granite ; limekiln ; purple gritstone ; red sandstone ; control countermeasure

水土流失；花岗岩；石灰岩；紫色砂页岩；红色砂砾岩；治理措施

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。