for no known non-biological process can produce oxygen from common materials insufficient quantity.
因为在我们已知的非生物学过程中,没有一种过程可以在普通材料供应充足的情况下产生氧气。
Looking at such an atmosphere, though, is tricky. Stars are so much brighter than the planetswhich orbit them that their light overwhelms the small amount reflected from a planet ssurface.
然而,观测到这样的大气层也是非常难的。恒星比以他们为轨道运行的行星亮得多。他们的光盖过了从行星表面上反射过来的少量光。
And this is where Fresnel comes in.
而这也就是菲涅尔的突破口。
Fresnel telescopes have not been developed in the past because the image formed by onethat was large enough to rival a useful-sized reflecting telescope would be several kilometresfrom the zone plate.
过去,菲涅尔设计的望远镜还制造不出来,因为要想使衍射望远镜的大小和正常使用的反射望远镜大小相同,它所产生的图像就会距离波带片数千米远。
But Dr Koechlin does not worry about that, because his Fresnel telescope will be in space.
然而,凯什兰博士并不为此担心,因为他的菲涅尔望远镜将会在太空中。
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