但是，哈佛大学的研究人员发现，徒步远行还有另一堪称好处的理由：防止中风的发生。

But researchers at Harvard University have found another good reason to take a hike: to prevent stroke.

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研究者综合从最近的梅奥诊所与其他六个来自世界各地的研究结果，发现雌激素50岁之前都是有防止中风的作用。

Researchers combined the results from a recent Mayo Clinic study with six other studies from across the world and found that estrogen is protective for stroke before age 50.

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而在这里，单一品种用药获利的可能性是非常小的：假设850人需要服用药物降低血压仅仅是为了防止中风。

Here, the likelihood of benefit to the individual is very small - it is estimated that 850 people need to take drugs to lower their blood pressure to prevent a single stroke.

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