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After dinner, we usually wipe our hands or mouths using a tissue which we can't make full use of but only half. The design of dividing a piece of tissue into two halves enables us to share the other half of the tissue with our friend. Thus one piece of tissue is used by two persons who can make contributions to reserving resources and enjoy the pleasure of sharing at the same time.
Beijing Forestry University
Beijing, China
Huiping Bao,
Beijing Forestry University