Reducing agent, a chemical substance that gives electrons to another substance. A reducing agent is in contrast to an oxidizing agent.

一种把电子给另一种物质的化学物质，还原剂相对的是氧化剂。

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As green tea can be assimilated by the body easily into a form of vitamin a, which is later synthesised into a substance called rhodopsin, it helps reducing radiation.

绿茶可以被人体吸收提供维生素a，而维生素a有助于合成视紫红质，视紫红质可以帮助减少辐射。

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Disinfection effect is of important significance for reducing cost of water treatment and preventing harmful organic substance producing.

消毒效果对降低水处理成本和防止有害有机物产生具有重要意义。

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If we are serious about reducing substance abuse, crime and recidivism, and saving taxpayers money, then we must accept that our criminal-justice system is filled with seriously addicted people who need treatment to change their behavior.

WSJ: The War on Drugs Itself Is Causing Most of the Damage

But she said downsides included cutting the substance of important issues by reducing them to 140 characters, being too busy to "really engage" with people and making voters who are not on Twitter feel isolated.

BBC: Social media and the PCC elections: Tweeting candidates

Birds have been found with the substance congealed on their feathers, reducing their waterproof coating and ability to stay warm and afloat at sea.

BBC: Seabird deaths substance 'identified as oil substance'