SSS 2012-06-11
时间：2019-01-08 作者：英语课 分类：Scientific American(六)月
City kids have smorgasbord of food choices. But they also face food allergies 1 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 densities 2. The work is in the journal Clinical Pediatrics. The scientists collected allergy 3 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 varied 4 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 pollutants 5 that may predispose them toward allergies. Solving this puzzle could help protect kids from common foods that can do them uncommon 6 harm.
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- 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
- 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。
- 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。
- 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。
- 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