但是这更清洁的空气也是有代价的。
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.
美国人在其后数十年中取得的进步使我们的孩子更加健康，我们的水和空气更加清洁，我们的家园更适于居住。
What Americans achieved in the decades that followed has made our children healthier, our water and air cleaner, and our planet more livable.
其他的益处包括更多的能源安全和更清洁的空气。
Other benefits include more energy security and cleaner air.
如果产生的效益-不管是空气更清洁还是银行更稳定-表明其成本升高是值得的那还可以接受。
That is acceptable if the benefits—whether cleaner air or stabler banks—justify the costs.
尼科尔斯表示，先进的过滤系统将意味着，即便是使用后从这座大楼排出的空气，也会比这座城市最清洁的那天的空气更纯净。
An advanced filtration system will mean that even the air expelled from the building after use will, says Mr Nicholls, be cleaner than the air in the city on the cleanest day.
如果这一大胆的举动能够奏效，我们就可以为更清洁的空气、不再那么堵塞的道路网和公共交通将获得的几十亿美元而欢呼了。
If that brave action were enough, we would be cheering the advent of cleaner air, less gridlock and billions of dollars for mass transportation.
如果更清洁的空气是结果，那么可能是因为在于从工厂烟囱排放了粉尘减少或者汽车尾气减少了。
If the end is for cleaner air, the problem might be that of reducing the dust discharge from power-plant stacks, or reducing the quantity of irritants from automotive exhausts.
结果就是建筑物和周围空气都更清洁似乎混有亚洲血统。
The end result is a cleaner building surrounded by cleaner air.
首先，它能让空气更清洁。
首先，它能让空气更清洁。
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