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Walking down the street, we will receive many leaflets. Usually we don’t want most of them. However, we would accept them in order not to miss the information we are interested in. That’s a waste of paper. If there is a Leaflet Obtainer, we can get the leaflets after our own heart. At the bus stop, in the park or at the airport.
SI CHUAN UNIVERSITY
Chengdu, China
SI CHUAN UNIVERSITY
Chengdu, China
Jian Li, Ruili Wu, Xi Chen,Wei Wang