They keep our air clean, reduce noise pollution, improve water quality and provide food and building materials.

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。

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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。

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Examples range from contamination of the food or water supply, to high levels of air or noise pollution, a chemical accident, a disease outbreak or a natural disaster.

这方面例子的范围包括从食物或水供应的污染，到空气或噪音高度污染、化学事故、疾病暴发或自然灾害。

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Over the years, the government has taken steps to address the problem, including regulating low-frequency noise like water pumps, and reducing maximum decibels.

BBC: Taiwan's noise pollution dilemma

Key recommendations in Defra's report include a legal requirement for vessels to use "pingers", a device which will emit a noise under water to warn dolphins off.

BBC: Dolphins plan dismissed

"After my last dive, after I came up from the water, I heard the noise and saw the total and that is when the happy emotions swept me, " said Zakharov.

WSJ: Social Media