When a pencil is sharpened, the pencil needs to be contacted with the cutting edge and broached back and forth along the guiding groove.
削笔时只要将笔贴在刀刃上，沿导向槽往复拉削即可。
When a pencil is sharpened, the pencil needs to be contacted with the cutting edge and broached back and forth along the guiding groove.
削笔时只要将笔贴在刀刃上，沿导向槽往复拉削即可。
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