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However, with the combination of knife and laser light, security of the knife can be enhanced which also improved the convenience of the knife.
Laser light can coincide with the line nicely and forms a right triangle whose hypotenuse parallels with the blade and one of its straight edges parallels with the plane. In the process of using a knife for cutting, we have to twist our head to look over the line in order to keep it straight. Therefore, we may ignore the knife keeping on cutting and lead to an injury on our hands.
Dingxi Teachers College