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The tissue in public toilets,"-1" logo on the each tissue .If you take a piece of tissue,you can see "-1" logo.Most pe0ple have energy saving ideas.Do you have the heart take it more?
Beijing Technology and Business University
Beijing, China
Lihaozhe Li,
Beijing Technology and Business University
Miao Lu,
Beijing Technology and Business University
Peng Chen,
Beijing Technology and Business University
Yingying Hong,
Beijing Technology and Business University
