What is particularly characteristic of classical Athens, however, is the focus of definitions of civilization on the polis, the city-state.

什么是古代雅典所特有的型格，或者说，是对于城邦和城邦文明释义的关键。

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The study on the source of Chinese civilization has long been the focus of academic world. What we know in recent years are mostly build on this work of Mr. Li Ji.

关于中国文明起源的研究，一直是学术界的焦点，而近年来我们所能看到的多是建立在李济先生这本著作基础之上的。

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Recently, the academic discussion focus on the origin of civilization.

目前，学术界就文明起源问题讨论得非常激烈。

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It isn't uncommon to find environmentalists who are in awed disbelief that we can be spending billions searching for life on Mars and space explorers who feel that a focus on environmentalism narrows the reach and vision of our civilization.

CNN: How the search for aliens can help sustain life on Earth