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.
现在的河流很脏，因为有些人污染了河流。
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.
海狸住在小溪和河流附近，它们用木头、树枝和泥巴堵住小溪和河流。
Beavers live near streams and rivers and they block up the streams and rivers with like logs and sticks and mud.
如今河流排放越来越受到人为干预管束，需要出台国际河流流域的协定。
Today, river discharges are increasingly controlled by human intervention, creating a need for international river-basin agreements.
塑料在户外被焚烧，化学药剂被排入河流，环保组织 Greenpeace发现贵屿的空气、土地和河流被严重污染。
Plastic is burned outdoors and chemical water is poured into rivers, Greenpeace, an environmental group, has found the air, the earth and the rivers in Guiyu badly polluted.
发现河流的输入和输出，就是测量每一条流入和流出的河流的流量。
Discovering the inputs and outputs of rivers is a matter of measuring the discharges of every inflowing and outflowing stream and river.
这些泉水是溪流和河流的源头，这些溪流和河流穿过岩石，把山上的碎石带到低地。
These springs are the sources of streams and rivers, which cut through the rocks and carry away debris from the mountains to the lowlands.
起源于干旱地区的流动性河流和溪流通常被称为“内源河流”。
Regularly flowing rivers and streams that originate within arid lands are known as "endogenous".
然而，这导致了河流的水位下降，河流的水量减少。
This has led to lower water levels on the river, which has caused the river's water to decline.
长江是中国最长的河流，但它比世界上最长的河流尼罗河短。
Although the Yangtze is the longest river in China, it is shorter than the Nile, the longest river in the world.
我们现在正在安克雷奇博物馆建造一个时钟，它反映了阿拉斯加几条主要河流的总流量，这些河流对当地和全球的环境变化都很敏感。
We're now building a clock at the Anchorage Museum that reflects the total flow of several major Alaskan rivers, which are sensitive to local and global environmental changes.
它是一种观测台，按照河流自身的时间框架揭示了河流的“行为”，并让我们能够通过智能手表或智能手机见证这些变化。
It's a sort of observatory that reveals how the rivers are behaving from their own temporal frame, and allows us to witness those changes on our smartwatches or phones.
河流的流域会有不同，对于有多大的流量才能被称为河流没有严格的规定。
Rivers can differ in size and there is no strict rule on how big a flow of water must be to be called as a river.
很多人认为河流总是往南流，但世界上10条最长的河流中有4条就是往北流的。
A lot of people think that rivers always flow south, but 4 of the 10 longest rivers in the world flow north.
国际性河流的流域涉及145个国家的边界，其中一些河流流经数个国家。
International river basins extend across the borders of 145 countries, and some rivers flow through several countries.
河流卫士通过定期行走一段河流的河岸来看护河流。
River guardians look after a river by regularly walking a stretch of riverbank.
诺福克湖区是英国最大的湿地动物栖息地，它包括12个大湖，24个小湖，125英里长的河流，河流既有堤防，又可以航船。
The Norfolk Broads are Britain's largest wetland habitat with 12 large and 24 smaller lakes and 125 miles of navigable rivers and dykes.
有时也被称作亚洲水塔，它们所蕴藏的冰川是这片大陆中最大河流的水源，反过来这些河流维系着15亿人的生命。
They are also known as Asia's water tower. Their glaciers feed the continent's largest rivers-and those, in turn, sustain some 1.5 billion people.
但60年前，这条河流的未来——以及全美其它几百条河流的未来——却有着天壤之别。
But 60 years ago its future-and that of hundreds of other rivers across the country-looked very different.
河流专家声称他们已经最终找到了苏格兰境内最长河流的源头。
River experts claim they have finally found the source of the longest river in Scotland.
我们兄弟的河流解了我们的渴，河流载送我们的独木舟而且喂养了我们的孩子。
The rivers are our brothers; they quench our thirst. The rivers carry our canoes, and feed our children.
更复杂的是，特别是在非洲的一些国家，一国依赖多条河流；例如，几内亚境内有22条河流。
Adding to the complications is the fact that some countries, especially in Africa, rely on several rivers; 22, for instance, rise in Guinea.
只有在冬天才有可能到达到米尔内，原因是河流阻隔这两个城市，而河流之上却没有桥梁。
It's impossible to get to Mirny in any other season except winter because there is no bridge across the river between the two cities.
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.
酷热的非洲，几乎没有适于航海的河流，这些河流从内陆高原到海岸平原一路穿瀑布、过险滩，倾流而下。
Few of tropical Africa's rivers are navigable from the ocean, dropping as they do from interior tableland to coastal plains by a series of falls and rapids.
合作联盟在其报告里承认确定河流源头的方法有很多种，包括河流距离海洋的最远点，最大支流的源头等等。
The partnership acknowledged in its report that there were numerous ways of determining the source of a river, including the furthest point from the sea or the head of the most dominant watercourse.
如果保暖不存在问题的话，在河流中行进可能会更快，更省力。河流航行在热带地图可能是最主要的穿行方式。
River travel may be faster and save energy when hypothermia is not a factor. It may be a primary mode of travel and LOC in a tropical environment (use with caution if evading).
河流本身有处理废水的能力：健康河流中的溶解氧会消化细菌。
The river has its own natural capacity to treat waste: dissolved oxygen in a healthy river digests bacteria.
河流本身有处理废水的能力：健康河流中的溶解氧会消化细菌。
The river has its own natural capacity to treat waste: dissolved oxygen in a healthy river digests bacteria.
应用推荐