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Paper is a necessity for human life, and paper is made from trees.
Development of civilization, trees disappear quickly, we should pay attention to this problem.
In addition to large-scale conservation movement, we should also be saved paper in the daily.
We use the paper to made a tree, and ask a questions to everyone.
‘’Is this a tree? ‘’
Paper and trees, although implying the same material, but this cycle is unidirectional,
Tree can become paper, but the paper never change back to the tree.
Remind people to think for this issue .
Chaoyang University of Technology