Certain irrigation practices degrade soil quality and reduce agricultural productivity.

某些灌溉措施会降低土壤质量，降低农业生产力。

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Overall, organic farms tend to store more soil carbon, have better soil quality, and reduce soil erosion compared to their conventional counterparts.

总体而言，与传统农场相比，有机农场往往会存储更多的土壤碳，土壤更优质，并减少土壤侵蚀。

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The researchers argued that breakfast helps reduce daily calorie intake and improve the quality of our diet—since breakfast foods are often higher in fiber and nutrients.

研究人员认为，吃早餐有助于减少每天的卡路里摄入，改善我们的饮食质量，因为早餐食品通常含有较多的膳食纤维和营养。

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They said the dredged material would reduce water quality.

VOA: special.2009.10.06

Polls by the New York Times and CBS News and the Wall Street Journal and NBC News show growing public concern that efforts to cover uninsured Americans could reduce the quality of health care for those who already are covered by health insurance.

VOA: standard.2009.07.31

It emphasizes the need to promote sustainable and innovative approaches to protect water quality to reduce poverty and secure sustainable livelihoods.

UNESCO: MEDIA SERVICES

To improve quality and reduce errors, each pair of jeans is made from start to finish by a single group of workers.

ECONOMIST: Direct hit

Making the announcement today, the Transportation secretary said the new minimums would improve air quality and reduce the country's dependence on foreign oil.

NPR: The Marketplace Report: New SUV Mileage Standards