By whatever means, a lake is constantly gaining water and losing water: its water does not just sit there, or, anyway, not for long.
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。
The total volume of water in the saturated sample must therefore be thought of as consisting of water that can, and water that cannot drain away.
"因此，人们认为充满水分的岩石样本的总含水量既包括可能会渐渐流失的水分，也包括不会流失的水分。
Water in the vadose zone drains down to the water table, leaving behind a thin coating of water on mineral grains.
包气带中的水会沉降到地下水位，只在矿物颗粒表面留下一层薄薄的水膜。
From what I remember, water changes back and forth from water in lakes and oceans to vapor, and then back to water again when it falls as rain or snow, as precipitation.
根据我的记忆，水往复地变化，从湖泊和海洋里的水变成水蒸气，然后当它以雨或雪——也就是降水的形式落下时又变成水。
To do that, you have to drain the water from the land, move the water elsewhere, and divert the water sources such as rivers.
要做到这一点，我们得把水从土地中排出来，把它移到别的地方，并引导其他水源转向，比如河流。
Even though our earth is rich in water resource, there is still a shortage of water in many places because ocean water can't be used directly.
尽管地球的水资源丰富，但由于海水不能直接被利用，所以仍有许多地方缺水。
In developed countries such as the United States and some countries in Europe, laws about safe water are often stricter for tap water than for bottled water.
在发达国家如美国和一些欧洲国家，关于安全用水的法律通常对自来水比对瓶装水更严格。
Within about a millimeter of the water, air temperature is close to that of the surface water, and the air is nearly saturated with water vapor.
在离水不到一毫米的地方，空气的温度接近于地表水的温度，空气中的水蒸气几乎饱和了。
These vents on the ocean floor, they release this incredibly hot water, 3 to 4 times the temperature that you boil water at, because this water has been heated deep within the Earth.
海底的这些喷口会释放出温度高得难以置信的热水，温度比开水还要高3到4倍，因为这些水是在地球深处加热的。
This could cause rapid growth of water plants in the river, which can lead to the water ways getting clogged with organisms, which can change the flow of the water.
这可能会导致河里的水生植物快速生长，从而导致水道被生物体堵塞，从而改变水流。
One of these is the subtraction of water from the ocean by means of evaporation—conversion of liquid water to water vapor.
其中之一是通过蒸发的方式，把液态水转化为水蒸气——来减少海洋中的水分。
This was a small airless house and in the corner he discovered a water pump. He was so excited and went forward to draw water, but no water came out no matter how hard he tried.
这是一个不通风的小房子。在小角落里他发现了一个抽水机。他为此很兴奋，便上前去抽水，但无论他如何努力都没有水出来。
The solution is not bottled water. The solution is developing high quality public water systems that can provide inexpensive water for everyone.
解决的办法不是瓶装水，而是建立高质量的公共供水系统，为每个人都提供廉价的饮用水。
As we can see in Orme paying for trucking water into town, oftentimes the water is free, but the delivery of the water costs dearly.
如我们所见，在奥姆镇付钱用卡车运水到镇里，虽然水是免费的，但是运输的费用很高。
Siemens is another company with a robust water technology business and catalytic carbon water treatment filters are critical for water treatment.
西门子公司是另外一家拥有强大水处理技术的公司，它的催化碳水处理过滤器是水处理的关键技术。
The world isn’t running out of water. There is a lack of access to water and especially clean water for many folks.
目前世界上水资源并不匮乏，但是确实存在一些地方缺少使用水的途径，某些偏远地方对于清洁用水的需求尤其严重。
When Skipper Rolando spotted a color line in the water, with deeper blue water on one side and greenish blue water on the other, he signaled to put lines into the water.
船长罗兰多注意到水面上有一条色线，线的一侧是深蓝色的海水，而另一侧则呈现出蓝绿色，他示意该往水中放线了。
Fields become less resistant to water stress and the water table is no longer resupplied by water filtering through, worsening the effects of droughts.
农田的抗水分胁迫能力下降，而且地下水位得不到渗透水的补充，加重了干旱的影响。
What makes the water on the moon different from water on Earth is that it contains the ingredients for water - hydrogen and oxygen - but is not yet water.
促使月球上的水与地球上的水不同的是月球含有水的成分- - - - - -氢和氧- - - - - -但是还不是水。
With warm, buoyant water on top and cold, dense water below, the water column doesn't mix easily.
上层水温暖而浓度小，下层水寒冷而浓度大，因此水体难以混合。
If the water is cut off, use emergency water supplies — in water heaters and melted ice cubes.
如果水源被切断，使用热水器里的水或融化的食用冰块水救急。
Water efficiency provides long term water security by making use of the water we already have to sustain our communities and ecosystems.
提高水的利用效率，可长远保护我们社区和生态系统用水安全。
CLEAN WATER: A boy drinks water from a communal clean water source next to a contaminated river in Masiphumelele, Cape Town, South Africa. (Photo: ZUMA Press)
洁净水：在南非开普敦的马斯弗梅勒勒，一个小男孩正在喝水，水来自毗邻一条受污染河流的社区洁净水源。
The patrons had no idea that all of the fancy bottles of water were filled with the same water from a water hose in the back of the restaurant.
这些顾客不知道所有这些高档瓶装水中装的都是来自餐厅后面一根自来水管中相同的水。
The patrons had no idea that all of the fancy bottles of water were filled with the same water from a water hose in the back of the restaurant.
这些顾客不知道所有这些高档瓶装水中装的都是来自餐厅后面一根自来水管中相同的水。
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