The Romans observed that, when volcanic ash mixes with water and then cools, it gets extremely hard and almost impossible to break up.
罗马人观察到，当火山灰与水混合然后冷却，火山灰变得非常坚硬，几乎不可能分解。
Companies are pushing the technology hard but make it almost overwhelming even to dip a toe in the water for the average consumer, because there are so many compatibility issues to think about.
各家公司都在大力推广这项技术，但对普通消费者来说，即使是简单试水也几乎无法承受，因为他们需要考虑太多的兼容性问题。
The strong and hard carrots became soft and weak after they were put into the boiling water.
把本来结实又坚硬的胡萝卜放进开水后，它们便变得又光滑又柔软。
Nevertheless, a good number of thoroughgoing land animals later turned around, abandoned their hard-earned terrestrial re-tooling, and returned to the water again.
尽管如此，后来还是有相当数量的完全陆生动物做出改变，离开了它们辛辛苦苦重新改造的陆地，并回到了水里。
In countries like Tanzania, water is hard to get, and the job of collecting water falls on women's shoulders.
在坦桑尼亚这样的国家，水是很难弄到的，而收集水的工作就落在了女性的肩上。
The local people used to live a hard life because of the shortage of water.
因为缺水，当地人民过去过着艰难的生活。
It isn't like a duck to water to learn a foreign language, so you must work hard.
学习一门外语不像鸭子会游泳那么简单，必须努力才行。
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。
Even though we worked so hard, the production level of fruit was still low because it was short of water there.
尽管我们如此努力劳作，水果的产量仍然很低，因为那里缺水。
Although he went through a hard time, the farmer never became discouraged from achieving his goal—providing his village with a clean water source.
尽管经历了一段艰难的时期，这位农民在实现他的目标时从未气馁——为他的村庄提供干净的水源。
The carrot went in strong, hard, and unrelenting. But after going through boiling water, it softened and became weak.
胡萝卜本是硬的，坚固而且强度大，但受到煮沸的水的影响后，它变得柔软而脆弱。
Do not send supplies -knowing that millions of people are desperately in need of food and water, it is hard not to want to pack up a box of supplies and send it to Haiti.
不要邮寄捐赠品。了解到几百万缺乏食品和饮用水的灾民分散在各处，很难让人不产生把捐赠物打包寄送到海地的念头。
Gordon Johnson said the trout they'd caught were hard because of the terrible coldness of the water.
戈登·约翰逊说他们钓到的虹鳟鱼之所以肉很结实，是因为河水实在是太冷了。
That means changing incentives, improving information flows, and improving the way water use is governed. All that will be hard.
这就意味着修订奖励方案，改善信息流通和水资源管理——这些都绝非易事。
The prototypes were then exposed to the director's critical eye, and the final result of the hard labor was a design template covering every conceivable water simulation in the movie.
原始模型经过导演挑剔的目光，这些繁重工作的最后结果是一个设计模板，它涵盖了对电影中各种可能的海水的模拟。
The coastal living of most Australians has made the country’s athletes hard to beat when it comes to water sports.
沿海生活使澳大利亚的水上运动空前发达，这是其他国家的运动员无法可及的。
If so, it is hard to say what has helped: anti-pollution measures, algae barriers in the water or the deployment of algae-scooping teams.
如果是这样的话，到底有所改善的原因是什么还很难说，到底是抗污措施做得好呢，还是水里设了水藻障碍物，还是打捞水藻队伍的努力起了作用呢？
By now the man in the river was trying very hard to breathe and was even swallowing some of the river water.
这时，河里那个人已经呼吸困难，而且又呛了好几口水， 于是他说：「好啦！
He led you through the vast and dreadful desert, that thirsty and waterless land, with its venomous snakes and scorpions. He brought you water out of hard rock.
引你经过那大而可怕的旷野，那里有火蛇，蝎子，干旱无水之地。
While any good, clean water will keep your body and your skin hydrated, Lipski says hard water, the kind high in minerals, is especially good.
Lipski说，干净的水能润泽你的皮肤。硬水，即含有大量矿物质的水，尤其有效。
Today I saw a sign that said "subject to flooding" and I laughed out loud, finding it hard to imagine water in the relentless sunshine.
今天我看见有一块牌子上写着“小心洪水”，我不由得大声笑了出来，难以相信在这样酷热的阳光下会有洪水。
Beyond pity at seeing residents of a rich, proud country scavenging for food, hoarding bottled water and huddling for shelter on schoolroom floors, it was hard not to feel admiration as well.
看到一个富裕而骄傲国家的居民四处寻找食物、储藏瓶装饮用水和避难于学校教室，在地板上缩成一团的情形，除了同情之外很难不感到钦佩。
A chelating agent that softens hard tap water by binding with dissolved metal ions, preventing them from being deposited as a yucky residue on your nice clean dishes.
一种螯合剂，通过与水中溶有的金属离子结合来软化硬质水，这样这些水垢就不会残留在你洗好的干净盘子上了。
As a child with younger siblings I had to work hard: my daily routine included fetching water, cooking and changing nappies.
作为一个有着幼小弟妹的孩子，我必须努力劳动。我日常的工作有：取水，做饭和换尿片。
And while hard water occurs naturally in some parts of the country, it's by no means found in all of them.
虽然美国某些地方天然含有硬水资源，但并不是全美所有地方都有硬水分布。
And that means, the battle ahead with the Internet Water Army will be long and hard.
这意味着，与互联网水军的战斗将是漫长而艰巨的。
And that means, the battle ahead with the Internet Water Army will be long and hard.
这意味着，与互联网水军的战斗将是漫长而艰巨的。
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