The knife is mainly used for cutting, cutting, cutting, cutting, and it is inconvenient for cutting soft things such as cotton and silk. When people use two knives to cut relative to each other in practice, scissors are produced. Unlike a knife that is unilaterally applied, a scissors is a…

Knives are one of the oldest tools of mankind. For humans without carapace, claws and sharp tips, to survive in the jungle world of the jungle, the knife is their most important helper. The acquisition of food, the manufacture of utensils, and the maintenance of life are all inseparable from…