看！在那边明亮的窗户。
如果没有明亮的窗户和眼镜，你能想象生活会是怎样的吗？
Blodgett's innovation that makes glass invisible, Can you picture life without clear windows and eyeglasses?
如果一个人站在明亮的窗户前，对面的墙壁会反射部分光线落在人身上。
A person with his back to a bright window will have light reflected from an opposite wall falling on him.
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