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When we use pencil in daily life , the need of the pencil stump is always different , especially art students ,they often need longer pencil stump to paint . But ,the general pencil sharpener can’t suit the need of them.The sharpener in the screen is able to adjust the gradient of the knife to make pencil stumps of all lengths
Wuhan Institute of Technology
wuhan, China
Shuhang Xu,
Wuhan Institute of Technology
