Scientists have known since 2002 that the chemical exists in certain products and have urged the food industry to reduce levels.

科学家们从2002年就发现一些食品含有这种化学物质，并已强烈要求食品工业减少这种化学物质的含量。

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Improvements of working conditions helped to reduce levels of absenteeism.

工作条件的改善已令旷工率降低。

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Improvements in working conditions helped to reduce levels of absenteeism.

工作条件的改善使旷工率降低。

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Building owners say such make-overs are very important to reduce levels of greenhouse gases in New York.

VOA: special.2009.05.22

the United States announced a target to reduce its emissions by 17% below 2005 levels in 2020.

美国宣布了到2020年实现在2005年的水平基础上减排17%的目标。

对全球变暖的政策 - SpeakingMax英语口语达人

All of these things combined help to improve heart activity, lower blood pressure and cholesterol levels, and reduce bone and muscle loss.

VOA: special.2010.06.08

Under coalition plans, several thousand badgers could be shot, in an effort to reduce levels of bovine tuberculosis.

BBC: Badger cull: Government to delay scheme until next year

It also would require tobacco companies to reduce levels of nicotine in cigarettes.

CNN: Obama welcomes bill to regulate tobacco

First, it poured industrial quantities of lime (pulverised limestone or chalk) onto the soil to reduce levels of acidity.

ECONOMIST: Brazilian agriculture