If there are no truly non-venomous snakes, were the so-called non-venomous snakes, like constrictors and pythons, were they venomous at some point in their evolution?

如果没有真正的无毒蛇，那些所谓的无毒蛇，比如蟒蛇和巨蟒，在它们进化过程中的某个阶段是有毒的吗？

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But ambitious private companies are acquiring foreign brands in hopes of speeding up their evolution into international competitors.

但雄心勃勃的私营公司并购海外品牌则是希望早日加入国际竞争者行列。

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The workings of these institutions are important to comprehend if we are to predict their actions today and their evolution in the coming information age.

如果今天我们要预测他们的行为，以及他们在即将到来的信息时代的进化，这些组织机构的运行对于我们的理解是十分重要的。

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Here's a little video clip that I'd like to show you that talks about evolution and how humans have evolved in relationship to their food.

接下来我们看段视频,主要讲述了生物演化,还有人类和食物之间的演化关系

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Ellison sees Brazilian equity markets as having gone through two distinct phases in their evolution.

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He will be hands-on with a bunch of these companies through their evolution in these markets.

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"History, for all people, is a necessary part of their evolution and their growing process, " he said.

CNN: STORY HIGHLIGHTS