David Harrison and Gregory Anderson of Living Tongues say that many endangered languages are spoken by native cultures in close contact with the natural world.

VOA: special.2009.12.02

They would get lesions on their hands, for example, the part of their body that was really in close contact with the cows.

比如,在与奶牛亲密接触的身体部位,也就是手上 也许会出斑

耶鲁公开课 - 生物医学工程探索课程节选