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.
把旧轮胎建成新式道路可以减少噪音污染。
Turning old tyres into new roads can help cut noise pollution.
皮奇先生说，人工合成的发动机声音甚至有助于减少噪音污染。
Synthesised engine noises could even help reduce noise pollution, says Mr Peachey.
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