杰克，能把百叶窗拉开吗？我需要些阳光。
在次再说一遍，关键是光线，植物至少需要些阳光来将污物转化成食物。
Here again, the key is light, as to turn sewage into food, one needs plants that require at least some light.
即使你在宇宙空间里发现了些什么，你还是需要分辨这些光是否人造——外星人造的，还是说，它仅仅是反射的阳光。
Even if you spotted something suggesting a city in space, you'd still have to figure out whether the light was artificial - alien-made, in other words - or simply reflected back from the sun.
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