A millennium ago on a mountainside in Africa, a herd of goats kept a shepherd up at night after feasting on red coffee berries.

咖啡是山羊发现的。一千年以前在非洲的一个半山腰上，一群山羊吃下了一种红色的咖啡果子后，在夜里兴奋异常以至于牧羊人不能入睡。

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But when you have a large population, well, the whole population can't just get up and move to follow a wild herd of animals.

但是当你所属的种群人数众多时，就不能整个种群一起追踪一群野生动物。

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They try to round up a scattered herd of cattle.

他们试图把分散的牲口赶在一起。

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To survive, Mr Hanson is slowly building up a herd of bison on his property, has put up tourist cabins made from his own pine trees, and hopes to attract visitors who can be taken on photo shoots through the scenic Badlands.

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Investors who follow the herd often end up buying near the market top, riding it down, and then selling near the bottom.

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In the distance, a straggling herd of wildebeest arced up and back into the grass like dolphins leaping from the water.

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