牧民们向南迁移，沿着主要河流系统进入热带草原地区。
The herders shifted south, following the major river systems into savanna regions.
它与加拿大共享北美第二长的河流系统，拥有美国一半以上的海岸线。
It shares, with Canada, the second longest river system in North America and has over half the coastline of the United States.
它们与地球上的河流系统非常相似，地质学家认为它们是早已消失的河流留下的干涸的河床。
They bear a strong resemblance to river systems on Earth, and geologists think that they are dried-up beds of long-gone rivers.
令人惊讶的是，干旱地区拥有着世界上最大的一些河流系统，如澳大利亚的墨累-达令河、北美的里奥格兰德河、亚洲的印度河和非洲的尼罗河。
Arid lands, surprisingly, contain some of the world's largest river systems, such as the Murray-Darling in Australia, the Rio Grande in North America, the Indus in Asia, and the Nile in Africa.
但假如发生的话，它对南亚的主要河流系统将产生什么影响呢？
But if it did, what would the effect be on the major river systems of southern Asia?
以前，洪水是发生在这些河流系统中的[旁遮普]，但是降雨发生了偏移。
Previously, in the past, our flooding was in these river systems [in Punjab], but... the rainfall has shifted.
去年，我国被污染或被重度污染的主要河流系统已经占全国总水资源的26％。
Last year, polluted or seriously polluted water in the country's seven major river systems accounted for 26 percent of the total.
Hutchinson说，它可以通过连接地水准面的最低点来推测出地下河流系统的位置。
It infers the location of the underground river system by joining the lowest points from ground-level elevation measurements, Hutchinson said.
但他表示，这项研究发现，河流系统中的含氮量如此之高，根本无法被完全过滤掉。
But he says the study found that there is so much nitrogen in the river system that is simply can not filter all of it.
密西西比密苏里河，是世界第四最长的河流系统，运行主要是北南通过心脏的国家。
The Mississippi - Missouri river, the world's fourth longest river system, runs mainly north-south through the heart of the country.
了解关于拆坝带来的潜在影响的一条途径是回顾在本河流系统上修建大坝所造成的后果。
A way of understanding potential impacts induced by the removal of DAMS is to recall the results of the construction of the DAMS in the river system.
最近，一些有关非洲大型河流系统（比如流向莱索托高地的河流）的稳固的水协议正取得积极的进展。
Recently, there has been progress towards durable water treaties for several big African river systems, such as the waters that flow down off the Lesotho highlands.
中国的河流系统遭到同样的困境，而中国水利部报告显示，中国70%的河流和湖泊被污染。
China's river systems suffer a similar predicament, with the Chinese Ministry of Water Resources reporting that 70 per cent of China's rivers and lakes are polluted.
墨累-达令流域委员会，一个负责保护澳大利亚最大河流系统免于干枯的新组织，如今面临着艰巨的任务。
The Murray Darling Basin Authority, a new body charged with saving Australia’s biggest river system from expiring, has its work cut out.
高强度的土地开发，改变了周围的自然地形地貌，改变了河流系统、河漫滩、湖泊的自然流动。
High intensity land development changes the surrounding natural terrain and topography, and alters the natural flows of river systems, floodplains, and lakes.
本文基于河流系统概念，从河流健康研究的理论构架和诊断体系两方面对河流健康问题进行了研究。
The theoretical framework and diagnosis system of river health have been studied in the paper based on the concept of river system.
尽管亚马逊河保持一般的状况，但是在河流上游，例如秘鲁，人口密集的地区正在给河流系统增加威胁。
While the Amazon is in generally good shape, in the upstream regions, such as Peru, there are many high density areas of people that inject threat into the system.
墨累-达令流域委员会，一个负责保护澳大利亚最大河流系统免于干枯的新组织，如今面临着艰巨的任务。
The Murray Darling Basin Authority, a new body charged with saving Australia's biggest river system from expiring, has its work cut out.
为了发电，我们在国土尺度上，毁掉了地球生态系统中最关键的“基础设施”—河流系统，甚至整个水系统。
In order to produce hydropower, we have destroyed, on a national scale, the most crucial "infrastructure" ecosystem of the world - the water and river system, and even the whole water system.
第一项措施是默里-达令流域管理局，一个有权在整个河流系统设置河水抽取量的机构，旨在终止该流域内四个州的争吵。
The first is the Murray-Darling basin Authority, a new body with power to set limits on water extraction across the entire river system, in a bid to end the four basin states' bickering.
在中国，冰山的退化所产生的影响日趋明显，其中包括水资源短缺、水患频发、湿地退化和河流系统稳定性降低等。
In China, the impact from glaciers retreat are more obvious with each passing day, including water resource shortage, frequent inundation, wet land retreat and reduced stability of river system etc.
这些河流和河川系统被称作“外源河流”，因为它们的源头位于干旱地区之外。
These rivers and river systems are known as "exogenous" because their sources lie outside the arid zone.
因此，他们的第一个日历系统被自然地分为三个季节，每个季节都是根据河流的变化而划分：淹没期、下沉期和丰水期。
So, naturally, their first calendar was divided up into three seasons, each based on the river's changes: inundation, subsidence and harvest.
物种灭绝、森林砍伐、河流筑坝、洪水、臭氧层损耗、海洋系统恶化和许多其他变化都在加速发生。
Species extinction, deforestation, damming of rivers, occurrence of floods, the depletion of ozone, the degradation of ocean systems and many other areas are all experiencing acceleration.
事实上，它不是一条运河，而是一个由多条运河和河流相连的系统。
In fact, it's not one canal, but a system of canals and rivers linked together.
同样，我们正在开发的河流时间和其他计时系统可能会鼓励环境意识。
Likewise, river time and other timekeeping systems we're developing may encourage environmental awareness.
化肥和粪肥都释放氮到自然生态系统，如河流，从而破坏自然的平衡。
Both fertilizers and manure release nitrogen into natural systems such as rivers, upsetting the natural balance.
酷暑使得德国、比利时和法国赖以冷却发电站系统的河流温度上升。
The heat has warmed the rivers on which Germany, Belgium and France rely to cool power plants.
但含有除草剂的水不能再排向河流，而且我们知道低水位将会对习惯于高水位的河流生态系统造成危害。
But water containing the herbicide cannot be released back into the river and it is known that low water levels can harm river ecosystems accustomed to higher levels.
但含有除草剂的水不能再排向河流，而且我们知道低水位将会对习惯于高水位的河流生态系统造成危害。
But water containing the herbicide cannot be released back into the river and it is known that low water levels can harm river ecosystems accustomed to higher levels.
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