某一湖泊的“停留时间”并不是一个固定值。
A given lake's residence time is by no means a fixed quantity.
这取决于水进入湖泊的速度，而这又取决于降雨量和蒸发率。
It depends on the rate at which water enters the lake, and that depends on the rainfall and the evaporation rate.
气候变化严重影响着加拿大安大略湖西北部一些湖泊的停留时间。
Climate change is dramatically affecting the residence times of some lakes in northwestern Ontario.
不管用什么方法，一个湖泊的水总是在不断地增加和减少：它的水不会只是待在那里，或者待很久。
By whatever means, a lake is constantly gaining water and losing water: its water does not just sit there, or, anyway, not for long.
一旦收集了所有这些信息，就有可能可以判断一个湖泊的流量主要是由其表面还是地下的输入和输出导致。
Once all this information has been gathered, it becomes possible to judge whether a lake's flow is mainly due to its surface inputs and outputs or to its underground inputs and outputs.
但过去也有过一些时候，雨季的雨水浸透了这片“空白之地”，把它从沙漠变成点缀着湖泊的草原，成为各种动物的家园。
But there've been times in the past when monsoon rains soaked the Empty Quarter and turned it from a desert into grassland that was dotted with lakes and home to various animals.
我永远也不会忘记瑞士山岳的壮美和湖泊的秀丽。
I shall never forget the magnificence of the Swiss mountains and the beauty of the lakes.
我们的家乡是一个拥有数百个湖泊的美丽城市。
她的书提高了人们对于化学物质对世界湖泊的有害影响的认识。
Her book raised awareness of the harmful effects of chemicals on the world's lakes.
继续我们对沙漠湖泊的讨论，现在我想把重点放在所谓的“空白之地”上。
Continuing our discussion of desert lakes, now I want to focus on what's known as the "Empty Quarter".
气候变化正严重影响着位于加拿大安大略省西北部的一些湖泊的停留时间。
Climatic change is dramatically affecting the residence times of some lakes in northwestern Ontario, Canada.
在调查过去的气候条件时使用的一种非常古老的方法是测量古代湖泊的水位。
One very old method used in the investigation of past climatic conditions involves the measurement of water levels in ancient lakes.
根据这项研究，有两个因素对“空白之地”湖泊的形成很重要：首先，那里的降雨十分猛烈。
According to the study, two factors were important for lake formation in the Empty Quarter: first the rains that fell there were torrential.
注意“净”这个词：测量渗入湖泊和流出湖泊的地下水的实际数量是一个比仅仅推断它们之间的差异要复杂得多的问题。
Note the word "net": measuring the actual amounts of groundwater seepage into the lake and out of the lake is a much more complicated matter than merely inferring their difference.
而我们知道，出于我们对类似的古代沙漠湖泊的了解，我们知道这些湖泊并没有持续很长时间，平均从几个月到几年不等。
We know, because of what we know about similar ancient desert lakes, we know that the lakes didn't last very long, from a few months to a few years on average.
空气污染导致水体污染、增加海洋和湖泊的酸度。
Air pollution contributes to water pollution and increases acidity in oceans and lakes.
研究者把一个湖泊的鲑鱼全部捞走，青蛙数量很快翻了四番。
Researchers removed the trout from one lake, and the frog population soon quadrupled.
这一计划引起了广大争议，其中包括将湖泊的90%加以填充。
随着春天天气一天天变暖，雪开始融化，提高了湖泊的入流速度。
As spring progressed, warmer temperatures began melting snow, which raised the rate of inflow to the lake.
这个结果影响了湖泊的生态系统，水温的微小变化使其受到破坏。
The results have implications for lake ecosystems, which can be adversely affected by even small water temperature changes.
其中一个在半山腰有一个小亭子，顶部雕刻着柳树和湖泊的小图像都被修复了。
One of them had a small pavilion midway the hill, the small inlaid paintings of willows and lakes on the ceiling restored.
世界第十三大湖泊的故乡(以表面积计算)，以及戈壁沙漠里的针叶林。
Home to the 13th-largest lake in the world (in surface area) as well as taiga forest and the Gobi desert.
和周围高山向北方投下阴影一样，布满冰缝隙的冰川也在湖泊的表面冰层投下阴影。
Just as nearby mountains cast shadows, the crevassed glacier casts small shadows onto the lake's icy surface.
2010年9月初，季风暴雨不仅造成了印度河漫堤，还引起了邻近湖泊的水位升高。
By early September 2010, torrential monsoon rains had not only pushed the Indus River over its Banks, but also raised water levels in a nearby lake.
高山湖泊的风景确实宁静，就好像回到了几百年以前，有一种亘古不变的美丽。
The mountain and lake landscape is certainly peaceful, like stepping back hundreds of years in time, and is pristine in its beauty.
刚过了第六驿站，空气已经很清朗，我们可以看见山下壮观的布满湖泊的山谷。
Just beyond the sixth station the air cleared enough for us to see something of the spectacular lake-filled valley below.
生态学家非常担心持续干旱会对湖泊的生态系统和整个长江流域造成严重后果。
Ecologists are very worried about the serious consequences of the continuous drought on the Eco system of the lakes as well as the whole Yangtze River Valley.
紫色非硫细菌的成功在弗里克塞尔湖硫细菌可能是由于南极湖泊的极不寻常的季节性。
The success of purple non-sulfur bacteria in lake Fryxell may be due to the highly unusual seasonal nature of Antarctic lakes.
海洋正因温室气体的累积而趋向酸化，而河流湖泊的变暖正影响淡水鱼等生物的生存。
The oceans have become more acidic as a result of the buildup of greenhouse gases, and the warming of rivers and lakes is affecting freshwater fish and other species.
当水位达到海拔1459英尺(445米)时，两个湖泊的湖水可以流入红河的支流雪耶里河。
At a height of 1, 459 feet (445 meters) above sea level, both lakes spill into a Red River tributary, the Sheyenne River.
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