The prevalence of disease and insect pest is one of the factors, which restrict the yield in rape production.

在油菜生产中，病虫害的发生是油菜高产稳产的限制因子之一。

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The regularity of interval depends on the prevalence of disease in a given population as well as the biology of the tumor.

间隔时间的长短取决于出现该病的特定人群和肿瘤的生物学特性。

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Analytical work of the type recently done in Kenya, and new surveys of the prevalence of disease planned in several African countries, will help to improve the current estimates.

最近在肯尼亚开展的那种类型的分析工作以及在若干非洲国家计划对疾病流行率进行的新调查将有助于改进目前的估计。

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So, this just shows as the vaccine was distributed, given to more people, that prevalence of the disease dropped dramatically.

因此,这表明随着疫苗的推广,以及接种人数的增加,该疾病的患病率显著降低

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Those same estimates say that if you could turn that around, that if the world could eat the recommended level of fruits and vegetables, that you'd reduce the prevalence of heart disease by 31%.

反过来说就是,如果大家都能食用适量的水果和蔬菜,那心脏病的普遍性将降低31%

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Then, also emphasizing in the case of smallpox, how even after the scientific discovery was made, it took many, many decades for people to be able to produce the vaccine in large enough quantities and distribute it, so that you could think about making an impact on global prevalence of the disease.

同时重点就天花疫苗的发展展开了讨论,而即便当科学发现了天花病毒,仍然过了许多年,人类才能够,大规模生产并使用天花疫苗,由此你们可以了解到,在全球范围内,疫苗给天花以致命一击

耶鲁公开课 - 生物医学工程探索课程节选

The label that the FDA gives the new drug, the competition that it faces in the marketplace and the prevalence of disease are critical factors in determining what a new treatment will generate.

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Also, the prevalence of the disease increases with age, meaning some people develop it as they age.

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The prevalence of the disease, the leading cause of amputation, more than doubles in this age group.

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