他们保持我们的空气清洁，减少噪音污染，改善水质，提供食品和建筑材料。
They keep our air clean, reduce noise pollution, improve water quality and provide food and building materials.
他们受困于噪音和干扰，且悲观地认为情况不会得到改善。
They are plagued by noise and interruption, and pessimistic that the situation will ever be improved.
每天对这些实验灵敏度的改善经常会产生附加的噪音。
"The daily business of improving the sensitivity of these experiments always throws up some excess noise," says Danzmann.
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