Officials modeled the system on the sulfur dioxide trading market established in the U. S. in 1995, which has successfully cut levels of acid rain.

1995年，美国在二氧化硫交易市场所建立的一个系统，成功减缓了酸雨的现象，欧洲官员则效仿了这个系统。

youdao

Could Norway keep its standard of living and yet cut its emissions to Moroccan or even Ethiopian levels?

挪威能否在保持其生活水平的同时，将其碳排放削减到摩洛哥的水平，甚至埃塞俄比亚的水平呢？

youdao

We need to cut nitrate levels in water.

我们需要降低水中的硝酸盐含量。

《牛津词典》

India,for example, has promised to cut emissions by at least twenty percent from two thousand five levels by two thousand twenty.

VOA: special.2009.12.26

It has pledged to cut those emissions by 20 percent of 1990 levels by 2020.

VOA: standard.2009.11.26

The White House says President Barack Obama will attend next month's climate change summit in Copenhagen,Denmark, and will make a provisional pledge to cut U.S.greenhouse gas emissions by 17 percent from 2005 levels by 2020.

VOA: standard.2009.11.26

The drug also helped to cut levels of "bad" cholesterol in some patients.

BBC: Drug raises 'good' cholesterol

The main treatment is injections of a chemical to cut levels of testosterone - the driving force of many prostate cancers - but it causes side effects.

BBC: Skin patches 'tackle prostate cancer'

Friends of the Earth said it had studied reports produced on air pollution in Scotland's four major cities last year and found most would fail to reach tough targets due to take effect in 2005 to cut levels of nitrogen dioxide, which is emitted by cars.

BBC: Valley 'most polluted area'