研究：雾霾天仍然可以适当锻炼
<p><span word="Walking">Walking</span> <span word="or">or</span> <span word="cycling">cycling</span> <span word="is">is</span> <span word="good">good</span> <span word="for">for</span> <span word="you">you</span> <span word="even">even</span> <span word="in">in</span> <span word="polluted">polluted</span> <span word="cities">cities</span>, <span word="researchers">researchers</span> <span word="have">have</span> <span word="found">found</span>.</p><p>研究人员发现，即使在有空气污染的城市，行走或骑车也是对健康有益的。</p><p><span word="The">The</span> <span word="health">health</span> <span word="benefit">benefit</span> <span word="of">of</span> <span word="physical">physical</span> <span word="activity">activity</span> <span word="outweighs">outweighs</span> <span word="the">the</span> <span word="harm">harm</span> <span word="caused">caused</span> <span word="by">by</span> <span word="chemicals">chemicals</span> <span word="and">and</span> <span word="dust">dust</span> <span word="puffed">puffed</span> <span word="out">out</span> <span word="by">by</span> <span word="traffic">traffic</span> <span word="and">and</span> <span word="industry">industry</span>, <span word="according">according</span> <span word="to">to</span> <span word="Cambridge">Cambridge</span> <span word="academics">academics</span>.</p><p>根据剑桥大学学者的研究，体育锻炼对健康的好处要大于汽车和工厂排放的化学物质和灰尘造成的危害。</p><p><span word="Air">Air</span> <span word="pollution">pollution</span> <span word="is">is</span> <span word="a">a</span> <span word="major">major</span> <span word="problem">problem</span> <span word="in">in</span> <span word="British">British</span> <span word="cities">cities</span>, <span word="and">and</span> <span word="is">is</span> <span word="estimated">estimated</span> <span word="to">to</span> <span word="contribute">contribute</span> <span word="to">to</span> 40,000 <span word="early">early</span> <span word="deaths">deaths</span> <span word="in">in</span> <span word="Britain">Britain</span> <span word="every">every</span> <span word="year">year</span>.</p><p>空气污染是英国城市的主要问题，据估计，英国每年有四万人因空气污染而过早死亡。</p><p><span word="People">People</span> <span word="who">who</span> <span word="exercise">exercise</span> <span word="in">in</span> <span word="polluted">polluted</span> <span word="areas">areas</span> <span word="are">are</span> <span word="thought">thought</span> <span word="to">to</span> <span word="put">put</span> <span word="themselves">themselves</span> <span word="at">at</span> <span word="increased">increased</span> <span word="risk">risk</span>, <span word="because">because</span> <span word="they">they</span> <span word="take">take</span> <span word="deeper">deeper</span> <span word="breaths">breaths</span>, <span word="inhaling">inhaling</span> <span word="more">more</span> <span word="of">of</span> <span word="the">the</span> <span word="toxic">toxic</span> <span word="pollution">pollution</span> <span word="and">and</span> <span word="particles">particles</span> <span word="that">that</span> <span word="do">do</span> <span word="such">such</span> <span word="damage">damage</span>.</p><p>人们通常认为，在污染区域进行体育锻炼会增加患病风险，因为锻炼时呼吸更深，会吸入更多有毒污染物和颗粒物，而这些污染物都对健康有害。</p><p><span word="But">But</span> <span word="a">a</span> <span word="new">new</span> <span word="study">study</span>, <span word="published">published</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Preventive">Preventive</span> <span word="Medicine">Medicine</span>, <span word="suggests">suggests</span> <span word="that">that</span> <span word="the">the</span> <span word="act">act</span> <span word="of">of</span> <span word="exercising">exercising</span> <span word="outweighs">outweighs</span> <span word="this">this</span> <span word="risk">risk</span>, <span word="because">because</span> <span word="physical">physical</span> <span word="activity">activity</span> <span word="reduces">reduces</span> <span word="the">the</span> <span word="risk">risk</span> <span word="of">of</span> <span word="diseases">diseases</span> <span word="such">such</span> <span word="as">as</span> <span word="diabetes">diabetes</span>, <span word="heart">heart</span> <span word="disease">disease</span>, <span word="and">and</span> <span word="several">several</span> <span word="cancers">cancers</span>.</p><p>但是，一项发表在《预防医学》期刊上的最新研究表明，锻炼带来的益处远甚于它带来的风险，因为体育活动可降低患糖尿病、心脏病和某些癌症的风险。</p>
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