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(How Much Graphite Is Wasted Sharpening A Pencil)
Graphite is a highly valued material in the world of sharpening pencils because it is durable, resistant to corrosion, and has excellent。，、，，。
(How Much Graphite Is Wasted Sharpening A Pencil)
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(How Much Graphite Is Wasted Sharpening A Pencil)
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(How Much Graphite Is Wasted Sharpening A Pencil)
