肮脏的空气和水是有害的。
而如果这两种介质的密度相差较大，就像空气和水那样，那么大部分的能量将会折射回来，只有一小部分会继续传播进入到新的介质中。
If the two media have really different densities, like air and water, then most of the energy is going to be reflected back, very little of it will keep going and get transmitted into the new medium.
不像以前那么好了。空气和水都被严重污染了。
It's not so good as before. Both the air and the water are badly polluted.
被污染的空气和水可以杀死植物、动物，甚至是人。
Polluted air and water can kill plants, animals, and even people.
法律禁止乱扔垃圾，禁止污染空气和水。
There are laws against littering and against making the air and water dirty.
它可能会污染空气和水。
水蒸发留下盐分，形成白色的地壳层，阻止空气和水进入下面的土壤。
The water evaporates and the salts are left behind, creating a white crustal layer that prevents air and water from reaching the underlying soil.
我们担心电网会崩溃、不可再生资源会枯竭、沙漠会扩张、岛屿会消失、空气和水会受到污染。
We fear the breakdown of the electric grid, the end of non-renewable resources, the expansion of deserts, the loss of islands, and the pollution of our air and water.
空气和水是生命所必需的东西。
空气和水很快就被污染了。
希望就如空气和水，是人生的必需品。
没有空气和水，世界上就不会有生命。
Were there no air or water, there would be no life in the world.
月球上没有空气和水。
它污染土壤、空气和水。
像食物、空气和水一样，能源在人类的生活中必不可少。
Like food, air, and water, energy is essential to human existence.
双方休戚相关，通过循环利用空气和水来调控彼此的温度。
By recycling air and water, the two drink together, breathe together and regulate each other's temperature.
拥有3亿人口的美国，相比较40年前2亿人口时，空气和水都更清洁干净了。
With a population of 300 million, the United States has cleaner air and water now than 40 years ago, when the population was 200 million.
我们的城市会变得越来越拥挤，景色会变得更加杂乱，空气和水也会变得愈发肮脏。
Our cities will continue to become more crowded and noisome. The landscape will get more cluttered, the air and water even dirtier.
森林被毁了还能长出来，空气和水被污染了还能被净化——但物种一旦灭绝就意味着永远失去。
Forests razed can grow back, polluted air and water can be cleaned - but extinction is forever.
你并不需要请教专业咨询人士（当然你可以这样做），只需要融合这些基本元素就好：火，土，空气和水。
You don’t need to bring in a consultant (though you certainly can), just incorporate the basic elements: fire, earth, air, and water.
你并不需要请教专业咨询人士（当然你可以这样做），只需要融合这些基本元素就好：火，土，空气和水。
You don't need to bring in a consultant (though you certainly can), just incorporate the basic elements: fire, earth, air, and water.
毕竟，他推断，众所周知一些单细胞生物可以进入一种类似冬眠的状态，并在没有空气和水的状态下生存数年。
After all, he reasoned, some single-celled creatures are known to enter a hibernation-like state and survive for years with no air or food.
据世卫组织总干事陈冯富珍博士说，气候变化将以极为不利的方式影响健康的一些最基本决定因素：食物、空气和水。
Continuing climate change will affect, in profoundly adverse ways, some of the most fundamental determinants of health: food, air and water, according to WHO Director-General Dr Margaret chan.
据世卫组织总干事陈冯富珍博士说，气候变化将以极为不利的方式影响健康的一些最基本决定因素：食物、空气和水。
Continuing climate change will affect, in profoundly adverse ways, some of the most fundamental determinants of health: food, air and water, according to WHO Director-General Dr Margaret chan.
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