The method of using a paper folding knife is as follows:

1. Fold the rectangular paper and open it.

2. The two corners of the short side are folded to the midline position.

3. The long sides of both sides are respectively folded inward by 1/3 of the width.

4. The triangle at one corner is folded inside along the crease.

5. Fold in half along the center line.

6. The small triangles of the folded part are inserted together.

7. The middle position is folded down at an angle of 45.

8. The ends are folded back next to each other at an angle of 45.

9. unfold, that is, fold the middle position of the two creases into it along the creases.

1. Fold both sides of the end upwards respectively.

11. Fold the two sides up separately.

Dao is one of the eighteen weapons, one of the nine short and nine long, and the first of the nine short (Dao).

The knife is a short weapon with a single long blade. Knives and swords. At the same time, it generally refers to tools that can be used for cutting, cutting, chopping and stabbing. Together with daggers, it is also called eating utensils. The original shape of the knife is very close to that of the graupel. Its shape is short handle, looking up, the ridge is unadorned and the blade is long.

By the Spring and Autumn Period and the Warring States Period, the shape of knives had changed greatly. In the Han Dynasty, knives gradually developed into one of the main battle weapons of infantry, such as ring-headed knives, and many different forms of long-handled knives appeared. There are only a few bronze knives in the world, and they are all thin and light in shape, with the thickest part of only .35 cm. Their shapes are roughly divided into short-handled head-looking knives, long-edged knives, flat-edged knives and curved-edged knives.

In primitive society, ancient people used stones, mussels and animal bones to make knives of various shapes. Most of the stones they choose are quartz stone, sandstone, flint and crystal stone.

Stone knives made of these stones are hard and sharp, and they are good chopping tools. Secondly, clam knives and bone knives made of clam shells and animal bones are light and sharp, which are suitable for cutting utensils. Similarly, the ancients not only used knives as labor tools, but also carried them with them as self-defense weapons.