It is not easy to process the wavy shape, but in the processing, the wavy wrinkles of the iron have a notch, and it is inevitable to give birth to the tines.

So, on the basis of the knife, Ah made a serration that could expand the cut.

Sure enough, such staggered serrations that open to both sides are also conducive to better and faster cutting.

For this reason, the word 'tooth' also coined by Ah Yu contains the true history of this creation.

It's just that Zhang Jingtao doesn't know the specific meaning of this tooth word, and only listens to Ah He, the word 'stop' is closely related to the word 'zheng' of Zhang Zheng in his name of the Warring States period, but Zhang Jingtao didn't understand it, how could the word 'stop' be related to the meaning of 'sawtooth'?

But if he says there is, there must be.

I have to say that after the creation of smelting by civilization, Ah's creation is speeding up amazingly!

In this world, from ancient times to the present, no one has such a strong ability to observe the world and think logically.

It was the word 'mother' on the wooden board that made Zhang Jingtao immediately understand that the so-called mold should have been called a mother's tool.

The two sides of this master tool are like two movable right-angled hook plates, and the points in them are the same as the meanings of light and shadow, mirror image, and appendage, indicating that they are the pressed objects in the master tool.

If you can use a confined space to press out two identical things, it is called a mother and a mother and child.

The mother of this mother's tool, the hook below has a fixed meaning, and also has the meaning of plugging, therefore, it can also be seen that the mother and child right-angle plate edge can be opened.

The pressed mud bricks inside were revealed.

Zhang Jingtao stepped forward and helped Sister Watermelon to make a batch of bricks and transport them to the fire cellar to leave.

These bricks are not used in construction, although Ah He burned a lot of cement.

These bricks were used to build or repair the shape of the fire cellar in order to make the fire cellar more in line with Ah Ah's requirements.

After building an ordinary fire cellar, he found that many stones could not be melted, or melted for too long, and after comparing the fire cellar of the Flame Mountain, Ah Ha easily figured out that the high cave can store more sheep gas, so that the flame can maintain a certain degree of vigor, and it can form a thicker heat protection layer on the height, so as not to let the heat of the lower layer dissipate.

Even, she had the idea of building a double-decker stove.

This kind of thinking is too normal for the Silk people.

Because at the beginning, the Silk people used the heating method of separating human fire, and placed the fire hole and the human hole together to keep warm, so that later generations had a fire kang.

Recently, Ah Ah has been using pottery to cook food, and it is conceivable that Ah Ah easily thought about the question of whether fire and ore or pottery can be separated from each other.

After that, Ah Yi easily figured out that the two could be placed separately.

To this end, Ah Ah coined a word to represent this blast furnace technology.

The word is 'high'.

High, it seems to be a very strange word, why are the two mouths piled up like this and called high?

Knowing that the blast furnace is a flood of ancient times, it is not surprising, the high character, the lower part, is a double into the insulation fire cellar hole with the Zhou word frame, and the upper layer is a hole, this hole, although there is an isolation layer on the top 'one' pressed, the top can still feel the heat of the sun.

And the heat of the flame will radiate upwards, as Ah has always understood, like the letters she created when she baked potatoes

And the e that represents the reversal of the potato, that represents the fiery letter

It contains the shape of a flame rising upwards on a short bamboo strip.

For this reason, it is a good practice to thicken the walls of the furnace with bricks and earth to make it better insulated.

The surname Gao is a surname that is good at making blast furnaces and smelting.

A name like Gao Yuanli carries this smelting meaning.

When transporting the mud bricks, the watermelon asked: "Fu Xi Fu Xi, do you know how the name watermelon came from?" Why is it called watermelon? ”

Watermelon, the original primitive people naturally did not use this pronunciation, let alone have words.

It was Ah He who recently officially called this fruit watermelon, and for this reason, Sister Watermelon asked.

Zhang Jingtao was surprised and said, "Aren't you very good at picking watermelons?" You don't know? ”

Watermelon said: "I just knock the watermelon with my hands and listen to the sound to distinguish which ones are more ripe and sweeter, but many times I will make mistakes, such as listening to the ripe, and it is ripe when it opens, but it is not sweet." She said that although she didn't know how to pick the watermelons she picked back, if she picked them in the field, she would almost certainly be able to pick them very sweet. ”

Zhang Jingtao smiled, and found that few primitive people could observe as much as Ah, and said: "West, take the meaning of the direction of the sunset, which can also refer to the sunshine, watermelon planting...... No, no, watermelons grow in the wild, and they must be exposed to a lot of light to be very sweet, otherwise, the melons are white and tasteless, and because the flesh of the watermelon is as red as the sunset, Ah Ah has long discovered this, and now it is named watermelon, so Ah Ah picks melons, which are melons that can pick up light and can be very sweet, so they are usually very sweet. If you choose the watermelon picked back, Ah Ah is not no, she usually chooses the melon with bright skin color but not astringent, and the vines are thick, such melons, the basic light will be very good, but sometimes because of the fertility of the land, there will be some surprises. ”

The word watermelon is a record of this life technology, planting melons to have sunshine, no sunlight is better than not planting.

Of course, this is just to say that watermelons in the wild state, such as artificially cultivated, it is not easy to say, sweet or not, and chemical fertilizers have a lot to do with how the skin color loves, it can still be sweet.

The watermelon suddenly went to make bricks again, she was full of pride in making bricks, and even she had a lot of experience in making fire cellars.

Zhang Jingtao praised the bricks of watermelon before.

He didn't go to help the watermelon again, but went to the workshop again.

When I entered the shed, I saw Yukimi making a wax dagger, and Ah Ah was guiding her.

This wax dagger is very strange, it has two short wax branches on the top, one is vertical, the other is oblique, and at the tip of the blade under the dagger, there is also an extra wax sausage, which is tilted to one side.

To put it simply, it almost forms the shape of a 'dagger'.

Ah Yu saw Zhang Jingtao and said, "Fu Xi is here, just learn how to make a dagger or arrow wax." ”

Zhang Jingtao couldn't help but think of the production of those statues, for example, after the wax model of the statue is done, not only will the wax branch be pressed, but also a lot of nails will be nailed on the wax model, and then such a wax model will be used to make the mother of the statue, which is simply the destruction of the well-carved figure, why is this?

Zhang Jingtao asked: "Why is the wax pattern of the dagger made like this?" ”