这些区域确实改善了空气质量，而且科学表明，这意味着切实的健康收益——心脏病、中风和早产发病率降低，癌症、痴呆和哮喘等疾病的减少。

The zones do deliver some improvements to air quality, and the science tells us that means real health benefits—fewer heart attacks, strokes and premature births, less cancer, dementia and asthma.

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脂肪组织中的番茄红素与心脏病的发病率降低有关。

Lycopene in fat tissue has been linked with a reduced risk of heart attack.

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根据最新的27项研究，每天至少喝两杯牛奶可使结肠癌发病率降低22%。

Drinking two cups or more each day reduces the risk of developing colon cancer by 22 percent, according to a new review of 27 studies.

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We'v e shown that learning optimism prevents depression and anxiety in children and adults, roughly halving their incidence over the next 2 years.

研究证实，乐观可帮助儿童和成人,预防抑郁和焦虑，使未来两年的发病率降低一半。

哈佛公开课 - 幸福课课程节选

You have to test it by giving the vaccine to a large population of people, and then watching and seeing if you've reduced the incidence of the disease.

这样的测试的做法只能是,给大量人群分发疫苗,接着观察和了解,这种疾病的发病率是否有所降低

耶鲁公开课 - 生物医学工程探索课程节选

It dropped dramatically in the period from 1954-- this is these filled black bars refer to this axis, polio cases per 100,000 population dropped down to only three or four cases by 1956.

患病率在一九五四年后的,一段时间里急剧下降,该坐标轴上的这些黑色柱形图表明,到一九五六年,小儿麻痹症的发病率,已经降低至每十万人中仅三到四人发病

耶鲁公开课 - 生物医学工程探索课程节选