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.
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。
Cholecalciferol is produced by irradiation of 7-dehydrocholesterol with ultraviolet light either from the sun or from an artificial source.
胆钙化醇是7 ？脱氢胆固醇经日光或人工来源的紫外线照射而产生的。
Cholecalciferol is produced by irradiation of 7-dehydrocholesterol with ultraviolet light either from the sun or from an artificial source.
胆钙化醇是7脱氢胆固醇经日光或人工来源的紫外线照射而产生的。
You can't even see the source of the light that shines through. You can't tell if the light is from an artificial source or from the sun.
你不可以透过它看见树或人，连透射进来的光线源头也看不见，你不知道那光线是人工的，抑或是天然的阳光。
You can't even see the source of the light that shines through. You can't tell if the light is from an artificial source or from the sun.
你不可以透过它看见树或人，连透射进来的光线源头也看不见，你不知道那光线是人工的，抑或是天然的阳光。
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