(单词翻译:单击)
听力文本
Around 3 million deaths a year are linked to outdoor air pollution, but new research might have found a way to combat the problem.
每年约有300万人死于室外空气污染，但新的研究可能找到了解决问题的方法。
A new study found B vitamins could offset the negative health effects that come from breathing fine particulate matter.
一项新的研究发现，维生素B可以抵消吸入细颗粒物质对健康的负面影响。
The research focused on PM2.5, a pollutant that can cause sinus irritation, heart attacks and even premature death in some cases.
这项研究的重点是PM2.5，这种污染物在某些情况下可能引起鼻窦刺激、心脏病发作甚至过早死亡。
Researchers exposed 10 volunteers to polluted air from downtown Toronto for four weeks without vitamins. The air samples were fed through a face mask.
研究人员连续四周将10名志愿者暴露在多伦多市中心受污染的空气中，没有补充维生素。空气样本通过面罩进行提供。
Then, subjects were given a series of B vitamins while being exposed to the same pollution for another four weeks. The results showed the supplements reduced the negative effects by 28-76 percent.
然后，志愿者被给予一些维生素B，同时另外四周暴露于相同的污染中。结果表明，补充维生素B将负面影响降低百分之28到76。
Pollution is a growing health hazard, and cities across the globe struggle with levels of PM2.5 well above what's considered safe to breathe.
污染是一个日益严重的健康危害，全球各地城市应对PM2.5的水平远比被认为安全呼吸的高。
While this study did have encouraging results, the team behind it acknowledges the trial's limitations. Aside from the small sample size, the researchers don't know the exact dose of vitamins needed to halt the negative health effects.
虽然这项研究取得了令人鼓舞的成果，但它背后的团队承认了试验的局限性。除了样本量小外，研究人员还不知道需要维生素的确切剂量来停止负面健康效应。
The researchers think future studies should increase the sample size and focus on areas with even higher pollution, like China or India.
研究人员认为，未来的研究应增加样本容量，聚焦污染更为严重的地区，如中国或印度。
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词汇解析
1、expose
使暴露;使显露
Lowered sea levels exposed the shallow continental shelf beneath the Bering Sea..
海平面下降使白令海底部的浅层大陆架暴露出来。
For an instant his whole back was exposed.
一瞬间，他整个背部都露了出来。
揭发;揭露
The Budget does expose the lies ministers were telling a year ago.
预算案无疑揭穿了部长们一年前所说的谎话。
After the scandal was exposed, Dr Bailey committed suicide.
丑闻曝光后，贝利博士自杀了。
使暴露于（险境）;使遭受（危险或不快）
They had not been exposed to most diseases common to urban populations.
城市人口中多数常见的疾病他们都没有接触到。
A wise mother never exposes her children to the slightest possibility of danger.
明智的母亲决不会让她的孩子置身于一丁点儿危险之中。
2、acknowledge
承认（事实、局面等）
Naylor acknowledged, in a letter to the judge, that he was a drug addict.
内勒在给法官的信中承认自己吸毒。
Belatedly, the government has acknowledged the problem.
政府迟迟才承认了该问题。
公认，认可（某人的成就、地位、品质等）
He is also acknowledged as an excellent goalkeeper.
他也被公认为是一名出色的守门员。
Some of the clergy refused to acknowledge the new king's legitimacy.
一部分神职人员拒绝承认新国王的合法地位。
告知（信函等）的收到;确认…收悉
The army sent me a postcard acknowledging my request.
军队寄给我一张明信片告知我的申请书已收到。
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