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.
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。
Plants keep our air and water clean.
植物能保持空气清新和水源清洁。
Polluted air and water can kill plants, animals, and even people.
被污染的空气和水可以杀死植物、动物，甚至是人。
In China, the government is trying to solve not only air and water pollution problems but also noise pollution problems.
在中国，政府不仅试图解决空气和水污染问题，还试图解决噪音污染问题。
The water evaporates and the salts are left behind, creating a white crustal layer that prevents air and water from reaching the underlying soil.
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。
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.
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。
In nearby areas, gold mining has released mercury into the air and water.
而在附近的地方，淘金者们向空气和水源还排放水银。
Forests razed can grow back, polluted air and water can be cleaned - but extinction is forever.
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。
By recycling air and water, the two drink together, breathe together and regulate each other's temperature.
双方休戚相关，通过循环利用空气和水来调控彼此的温度。
There is, in fact, no market mechanism to take account of the cost of polluting the air and water in Hengjiang.
其实，在横江，根本就没有市场机制来顾及当地的空气污染成本和水污染成本。
By far the most populous country in the top 10, France ranks very high in air and water quality and fisheries management.
6200万目前世界前10名中人口最多的国家，法国在空气和水质量以及渔业管理方面排名非常高。
The opposition is about coal's air and water pollution and the devastating practice of mountaintop removal coal mining.
人们反对的是燃煤带来的烟气和水污染，还有能够削平山头的破坏性采煤行为。
You-you will make no terms with the spirits of fire and earth and air and water. You have made the Darkness your enemy.
你们——你们不与火、土、气、水的精灵妥协，将幽冥王国视作敌人。
Before landing on the beach, the oil had become "weathered," made foamy and gooey by extended exposure to air and water.
冲上沙滩之前，油块经过“风化”，在空气和海水作用下变得泡沫化，有粘性。
Our cities will continue to become more crowded and noisome. The landscape will get more cluttered, the air and water even dirtier.
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。
In the worst-case scenario, the fuel can spill out of the containment unit and spread toxic radioactivity through the air and water.
最糟的情况是，燃料会从容器单位中洒出，有毒的辐射会进入空气和水中。
It HAS long been known that the air and water encountered by people in their daily lives are filled with all sorts of micro-organisms.
大家早就知道，日常生活中我们所接触到的空气和水里都包含着各种各样的微生物。
Today, our air and water are cleaner, pollutionhas been greatly reduced, and Americans everywhere are living in ahealthier environment.
今天，我们的空气和水资源更加洁净，污染已大大减少，全美各地的人们生活在更健康的环境中。
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.
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。
The ministry said the number of accidents fouling the air and water doubled during the first half of 2010, with an average of 10 each month.
根据该署的调查，对空气和水体造成污染的意外事件在2010年的上半年翻番，平均每月达10起左右。
History shows that economic growth and technological change have given mankind not just greater material wealth, but also cleaner air and water.
历史已昭示我们经济的增长和科技的进步布景给人们带来了物质上的丰裕，而且还带来了清洁的水和空气。
It carries enough fuel, compressed air and water for a three-minute run, which should be ample for the driver, Charles Burnett, to take the record.
携带充足的燃料,压缩空气和水,仅仅需要跑3分钟的赛段,对于驾手,查尔斯,伯内特来说,打破原有记录,已经是手拿把掐的事了.
The pump and piping are designed to be kept full of water. But they tend to leak and develop alternating pockets of air and water, Mr. Friedlander said.
水泵和管道在设计上是应该充满水的。弗里德兰德先生说，但是它们发生了泄漏，变成了水气混合的状况。
The pump and piping are designed to be kept full of water. But they tend to leak and develop alternating pockets of air and water, Mr. Friedlander said.
水泵和管道在设计上是应该充满水的。弗里德兰德先生说，但是它们发生了泄漏，变成了水气混合的状况。
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