Fifteenth century Europeans' knew ', that the sky was made of closed concentric crystal spheres, rotating around a central earth and carrying the stars and planets.

第十五个世纪欧洲知道，那天空由闭合的同心水晶球形做成，转动在中央地球附近和运载星和行星。

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Building segments of the plant's solar arrays on Earth, along with supports and a central transmitter, would take two years or so.

太空太阳能电厂所需的各种光能收集板、支架和中心发射器等，可先在地面建造，耗时大约两年左右。

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It's a central human question that drives us to wonder about origins-of humans, life, the Earth, the Universe.

这是一个促使我们去发现关于人类、生命、地球和宇宙起源的中心问题。

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Butz first heard about the site when he began working for Cambridge Central Schools as an earth science teacher more than a decade ago.

WSJ: NY teacher delves into mystery of 'Indian Ovens'

In the living room, two wool-covered dog beds take center stage, flanking the central wooden bench along with earth-toned couches.

WSJ: A Gossip Girl's Main Stage

You hail from every corner of the Earth -- from Southeast Asia to Central Europe, from West Africa to South America.

WHITEHOUSE: My Fellow Americans