But new research suggests that this might have a protective effect a few years later when children start school.

VOA: special.2010.12.15

It turns out that if you give one child in a home the oral vaccine, you often have a protective effect in other children in the home as well because it spreads from one individual to another.

结果显示,如果给一个家庭中的,一个孩子服用了口服疫苗,就等于给家中的其他孩子,同样进行了保护,因为它会在个体之间进行传播

耶鲁公开课 - 生物医学工程探索课程节选

A lot of what we know ultimately about fat in the diet and risk for heart disease, risks for cancer from certain sort of diets, the protective effect of certain diets comes from studies that rely on just the kind of assessment that you guys just did.

我们最终了解的许多关于饮食中的脂肪,以及对心脏患病风险,一些特定饮食中存在的致癌风险,以及特定饮食中的保护作用的研究,都是以你们所做的这种评估为根据的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Another form of the enzyme creates a protective effect.

VOA: special.2009.10.20

"We saw a protective effect for drinking more than 4 cups of coffee per day."

VOA: standard.2010.06.30