这个20%增加数额对人类健康和经济生产力都有极其有害的影响：人民生病不能工作。
This 20 per cent increase has had a hugely detrimental impact on human health and on economic productivity: people are sick and unable to work.
Ellison说道，“我们的生物学是进化的权衡结果，所以了解这些历史和过程中的冲突可以帮助医学家们理解为什么我们会生病以及我们怎样才能保持健康。”
Our biology is the result of many evolutionary tradeoffs, and understanding these histories and conflicts can really help the physician understand why we get sick and what we might do to stay healthy.
科学家已经发现大象面临着很多健康问题，例如生病、关节问题和行为改变等，有时甚至会失去生育能力。
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