我们已告别了那段多数人希望效仿美国商学院的时代。

We have come out of a time where most of us wanted to emulate the American business schools.

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当然，刚开始的时候，这类生物燃料还是只能与传统的汽油或柴油混合使用，但迟早都有能够单独使用的一天。 到了那一天，我们就可以永远告别利用石油来提炼汽油的时代。

And although these biofuels will probably first be supplied preblended with traditional gasoline or diesel, one day we may use them alone and say good-bye to petroleum-based gasoline forever.

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当男孩们对于‘美国大兵’念念不忘时，和芭比娃娃说再见则是很多女孩告别童年时代的标志。

While boys often expressed nostalgia and affection toward gi Joe, renouncing Barbie appeared to be a rite of passage for many girls, Nairn said.

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