The technical school library can't make glass curtain walls. Reflectionglasscurtainwall refers to the external protective structure or decorative structure of a building, which can be displaced relative to the main structure through the supporting structure system without sharing the role of the main structure. There are two kinds of walls: single-layer and double-layer glass. Glass curtain wall is a beautiful and novel way of building wall decoration, which is a remarkable feature in the era of modernist high-rise buildings. 20 13 According to FLAP (Fatal Awareness Program), in Toronto alone, one to nine million migratory birds die from these glass curtain walls every year.