科学家们不知晓的是司机们的海马体是经过锻炼后变大的还是他们一开始就有着较大的海马体（因此具有先天的导航优势）。

What scientists didn't know was whether the drivers grew bigger hippocampi as they trained or whether they had big ones (and thus an innate navigation advantage) to begin with.

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那些失败学员的海马体自始至终没有发生变化，这表明成功的的士司机确实具有先天优势——他们的大脑比其他人更具延展性。

The hippocampi of unsuccessful trainees stayed the same throughout, which could suggest that successful cabbies really do have an innate advantage—their brains are more malleable than others'.

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例如，伦敦大学的研究表明，部分伦敦的出租车司机的海马体实际比非出租车司机对照组的要大。

For example, research at the University of London showed that part of the hippocampus of London taxi cab drivers is actually larger than that of a non-taxi driver control group.

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