We know that UV light gets absorbed by glass, so it shouldn't be able to go through the glass.

我们知道紫外光会被玻璃吸收，所以它无法通过玻璃。

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but from the inside, you know, there's a lot of glass.And you can, like... There's a lot of natural light,

但是从里面看，有很多玻璃。这里有很多自然光，

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It is a glass tube. He wants to narrow the light so he puts a couple of slits here.

这是根玻璃管子，他想要减少光的发散,所以在这里开了几个口子。

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