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SSS 2012-06-11

时间:2012-07-20 06:53来源:互联网 提供网友:gmeng   字体: [ ]
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 City kids have smorgasbord of food choices. But they also face food allergies1 more than do their country cousins. Researchers mapped food allergies in children across the U.S. And they found more cases per capita in areas with high population densities2. The work is in the journal Clinical Pediatrics. The scientists collected allergy3 information on more than 38,000 Americans under age 18, and they sorted the information by zip code. Six percent of children in rural areas had a food allergy. But that number jumped to 10% of kids in urban centers. Peanut and shellfish allergies in particular were more common. Although the frequency allergies varied4 by location, their severity did not. What explains this trend? It could be that rural dirt is good. In the country, children immune sytems get challenged early and often, and thus more properly trained. Or, it could be that urban dirt is bad. City children deal with pollutants5 that may predispose them toward allergies. Solving this puzzle could help protect kids from common foods that can do them uncommon6 harm.

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1 allergies 2c527dd68e63f119442f4352f2a0b950     
n.[医]过敏症;[口]厌恶,反感;(对食物、花粉、虫咬等的)过敏症( allergy的名词复数 );变态反应,变应性
参考例句:
  • Food allergies can result in an enormous variety of different symptoms. 食物过敏会引发很多不同的症状。 来自辞典例句
  • Let us, however, examine one of the most common allergies; hayfever. 现在让我们来看看最常见的变态反应的一种--枯草热。 来自辞典例句
2 densities eca5c1ea104bef3058e858fe084fb6d0     
密集( density的名词复数 ); 稠密; 密度(固体、液体或气体单位体积的质量); 密度(磁盘存贮数据的可用空间)
参考例句:
  • The range of densities of interest is about 3.5. 有用的密度范围为3.5左右。
  • Densities presumably can be probed by radar. 利用雷达也许还能探测出气体的密度。
3 allergy 8Vpza     
n.(因食物、药物等而引起的)过敏症
参考例句:
  • He developed an allergy to pollen.他对花粉过敏。
  • The patient had an allergy to penicillin.该患者对青霉素过敏。
4 varied giIw9     
adj.多样的,多变化的
参考例句:
  • The forms of art are many and varied.艺术的形式是多种多样的。
  • The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。
5 pollutants 694861490fe64672170a0da250a277c7     
污染物质(尤指工业废物)( pollutant的名词复数 )
参考例句:
  • Pollutants are constantly being released into the atmosphere. 污染物质正在不断地被排放到大气中去。
  • The 1987 Amendments limit 301(g) discharges to a few well-studied nonconventional pollutants. 1987年的修正案把第301条(g)的普通排放限制施加在一些认真研究过的几种非常规污染物上。 来自英汉非文学 - 环境法 - 环境法
6 uncommon AlPwO     
adj.罕见的,非凡的,不平常的
参考例句:
  • Such attitudes were not at all uncommon thirty years ago.这些看法在30年前很常见。
  • Phil has uncommon intelligence.菲尔智力超群。
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