At present, the windows on the building are mostly installed on a number of pieces of glass in the window frame in order to achieve the purpose of lighting lighting. For a large area lighting, you need a lot of window frame to install the glass. This lighting method to install the glass in the window frame, not only the construction is complex, difficult to clean, and a large number of window frames not only affects the lighting, and unsightly, destroyed the city's overall appearance and internal layout of the room coordination and harmony. 
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