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並前往https://www.un.org/en/academic-impact/recycling-paper-waste-make-pencils-eco-friendly-project-engineering-students-india

Recycling Paper Waste to Make Pencils: An Eco-Friendly ...

Recycling Paper Waste to Make Pencils: An Eco-Friendly Project by Engineering Students in India. Pencils, an ubiquitous tool around the world massively used ...

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