They block most of the solar energy so it never reaches Earth's surface.

它们阻挡了大部分的太阳能，使它永远无法到达地球表面。

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This is because only in that day, the moon will appear in the sun and the connection between the Earth, so will it be possible to block the sun and the moon formed the solar eclipse.

这是因为只有在那一天，月亮才会出现在太阳与地球之间的连线上，这样才有可能使月球挡住太阳而形成日食。

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At Cline Cellars, a Sonoma winery that has turned its rooftop solar, the only maintenance problem is dust, which can block out sunlight.

索诺玛县一家叫做Cline Cellars的酒厂屋顶的太阳能板，其唯一维护问题是会遮住阳光的尘土。

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Sandwiching the solar cells inside the device would block some light out and knock down power conversion efficiency even further, Filler cautioned.

FORBES: Magazine Article

It's pretty rare that a portable solar-based device offers much more utility than impressing your friends, but PiSAT Solar's K-Light won't only make you the coolest kid on your block: it might actually prove useful the next time you take a hike or find yourself hanging out in a developing country.

ENGADGET: PiSAT Solar's K-Light boasts a one-to-one charging ratio

Orbital debris could block all these benefits for centuries and prevent us from developing clean energy sources like space solar power satellites, exploring our Solar System and someday making humanity a multi-planetary civilization capable of surviving true climatic catastrophes.

FORBES: Beware Of Space Junk