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Now express delivery, take out these industries are very developed, which brings us convenience, but also brings great problems to the earth environment. Express delivery, take out box and other packages will be basically discarded after one use, so I want to make a packaging box that can be reused.Human beings have built cities, but destroyed the living environment of other creatures, especially birds. The electric pole in the city replaces the trees, but birds make nest on the electric pole is very dangerous, so this bird's nest is designed to let the birds have their own home in the city, which is the so-called urban forest.