This means that over generations their brains have grown bigger as they think in new ways about how to survive.

这意味着，这些鸟类由于思考如何生存下去的新方式，而又经过数代的繁衍，它们的大脑已经变得更大。

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For many conservatively minded Britons, the possibility of their family losing caste over generations is an alarming one.

在许多思想保守的英国人看来，家庭社会地位可能一代不如一代，这种局面足以让人忧惧。

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Later on, this craft was introduced to the folk communities, so that it could be passed on over generations and last till now.

后来这项工艺渐渐传入民间，才得以年复一年传承至今。

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Professor Auerbach describes how the evolution of vampires tells a great deal about a culture's fears, which change over generations.

VOA: special.2010.01.20

They have established over one hundred thousand national parks and protected areas, for the enjoyment of people today and for generations to come.

VOA: special.2009.09.28

Pope Benedict denounced what he called "the clouds of evil" over Africa that have brought war and ethnic rivalry, reducing the poor to slavery and depriving "future generations of the resources needed to create a more solid and just society."

VOA: standard.2009.03.22

Passed down over generations, the legends of the Dolomites read like fairytale accident reports.

BBC: Legends of the Italian Dolomites

Yet Mr Pastrana will have to overcome suspicion, cynicism and allegiances built up over generations.

ECONOMIST: Colombia

Cycles of violence repeat over generations, and shift from criminal violence to political crime to outright warfare and back again.

FORBES: In Defense of Political Economy: new ideas on development from the World Bank