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。
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。
The age of the Earth is central to that question, and it has been taken on by human cultures for millennia.
地球的年龄是这个问题的中心，已经被人类文化承载了几千年。
Satellite images of the Earth show that wildfires are rare in, say, northern Europe, and common in parts of central Africa and Australia.
地球的卫星成像显示如欧洲北部这样的地方很少出现野火，而非洲中部的一些地方和澳大利亚则常有野火。
The central idea behind a Space Elevator involves lowering a cable — perhaps constructed from asteroid material — from geostationary Earth orbit to the surface of the Earth.
太空升降机背后的核心理念包括降下一根电缆——也许是由小行星材料制成的，——从对地静止轨道到地球表面。
Perhaps nowhere on Earth is the dual creative and destructive nature of volcanoes more evident than in central Africa’s Virunga Volcanoes Massif.
或许，地球上没有哪个地方比中非的维伦加（Virunga）火山地块更明显地具有双重创造性和毁坏性。
Because the adopted N layers of rare-earth ion-doped ring-core optical fibers exist in a common central cladding region, the pumping efficiency is greatly improved.
由于采用的N层掺稀土离子环芯光纤存在一个共同的中心包层区，因此极大提高了泵浦效率。
Because the adopted N layers of rare-earth ion-doped ring-core optical fibers exist in a common central cladding region, the pumping efficiency is greatly improved.
由于采用的N层掺稀土离子环芯光纤存在一个共同的中心包层区，因此极大提高了泵浦效率。
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