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Our fingernail has beautiful three-dimensional surface.They have curved surface on two direction：up and down，front and rear.
But now,there is only curved surface on one direction on traditional nail clipper. It may hurt the old people or children because their fingernail is not very strong.
Hyperbola blades has hyperbolas on two direction，witch will be fit to the shape of fingernail.making the clipping more comfortable and safe.