追逐地位的欲望可以成为强大的动力。
一项在老鼠身上进行的新研究或许能帮助解释为什么饥饿能给人带来如此强大的动力。
A new study in mice may help to explain why hunger can feel like such a powerful motivating force.
无论在运动队还是在总统竞选中，每个人都乐于拥有强大的动力，因为这让他们更难停下来或者改变方向。
Whether it's a sports team or a presidential campaign, everybody relishes having the big momentum, because it makes them harder to stop or change direction.
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