Many researchers think a T-cell response would limit disease severity but would not stop you falling ill.

许多研究者认为t细胞应答能限制疾病的严重程度，但不能预防疾病。

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According to the X-ray, your disease may be diagnosed as T. B.

根据 X 光检查，你的病可能是肺结核。

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In autoimmune diseases, like arthritis or Crohns disease, t cells mistake fragments of the body's own cells for foreign invaders, leading to the body launching an attack upon itself.

在自身免疫系统疾病中，如关节炎或克隆恩氏病，T细胞误把自身细胞碎片当作外来入侵者，导致自己攻击自己。

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"What we found is that,in fact, even after measuring those additional biomarkers that there wasn't a great deal of benefit in terms of understanding who was more likely to develop heart disease" Doctor Wang says they did identify some combinations of biomarkers that improved predictions of heart attacks and strokes.

VOA: special.2009.07.15

And in particular, dairy maids, whose responsibility was to milk cows, and so they had a very intimate relationship with cattle, often didn't get disease.

特别是挤奶女工,她们的工作就是挤奶,她们与奶牛有紧密的关系,通常不会得天花

耶鲁公开课 - 生物医学工程探索课程节选

In addition to Jenner, there was a farmer named Benjamin Jesty, who recognized that farmers, being in contact with cows, didn't get disease as often as non-farmers did.

除了詹纳,还有个叫本杰明?加斯特的农民,他发现与奶牛接触的农民,不像其他人那样容易患天花

耶鲁公开课 - 生物医学工程探索课程节选

"These are women who don't have disease, who don't have menopause symptoms, who are using the therapies only to prevent something that might happen in the future, " said Bibbins-Domingo, an associate professor of medicine, epidemiology and biostatistics at the University of California, San Francisco.

CNN: Government panel: Hormone therapy 'not recommended'

Two years ago, the same studies showed that hormone replacement therapy didn't prevent disease.

NPR: New Studies: Low-Fat Diets Don't Prevent Cancers

It's not a vaccine in the traditional sense: It doesn't prevent disease.

CNN: Vaccine may shift odds against deadly brain cancer