There is no Wanmin umbrella, and there is no long street to send so-and-so.

Hua Yu left silently with a knife. What they left behind to the villagers was health and eternal memories.

"Knife, go."

"Master, where are you going next?"

"Oral, big adventure."

When the knife heard the words "big adventure", he began to dance again, jumping and jumping excitedly.

Huayu intends to walk to the mouth.

Knowledge of the human world told him that the nasal cavity and the mouth were very close to each other, and it was a quick walk to reach it.

But Hua Yu forgot that he was now the size of a germ.

In such an extreme comparison, the oral cavity and nasal cavity at this time are thousands of miles apart!

"Master, when will we be there?"

"It's coming, it's coming."

Hua Yu only remembered at this time that he had become smaller. The size of a bacterium, can it not be far away?

Let's hide the knife first, otherwise, he will have to be in a hurry with Huayu. What should I do if I start a child's temper and don't leave patiently, without "sugar" to coax him?

Along the way, two people walked and stopped. All exhausted. The knife stood on Hua Yu's shoulder, he was too tired, and he fell asleep in the runway backpack. I just cared about catching up along the way, and I didn't pay attention to the time, and I didn't know how long I walked.

At last they came to a place, where there were two doors like loose leaflets above and below, and the doors were blown in and out by the wind, and the spiritual liquid flowed out when they were opened and closed.

Hua Yu judged that they had arrived, the sinuses.

"Small, do you want to take the slide?"

"What is a slide?"

The French are strange, saying that the knife did not come from the human world? Why don't you even know how to slide a slide? Could it be that his area of activity was only in the factory or laboratory from the time he was born until he met me?

Hua Yu asked a series of rhetorical questions, and finally filled in the questions by himself.

Maybe he loves knives too much, right? Whoever it came from? Even if thirty-seven doesn't equal twenty-one, I don't care.

He's all mine now.

Unusual knives; one-of-a-kind knives; Dearest Knife. …… In short, it is my Huayu's knife.

Huayu introduced the knife to what is called a slide.

"Slide Slide:

Children's toys are the most popular among children.

As soon as you sit on your ass and put your hands on it, you will slide down, and there will be rotational and straight slips, each with its own good way to play.

Rotary.

I feel that the slide is very long, I play for a long time, and I spin it round after round, just like surfing, wave after wave;

The straight-slip type is different.

It feels the opposite of a rotating one. The speed is fast, rushing straight down, more exciting and more able to exercise courage. ”

"How? Knives, interested? Do you want to challenge it, straight and slide? ”

"Don't, whatever, don't."

"Why?"

"I don't know where my ass is."

"Hahaha, who doesn't know where the ass is? Isn't your ass just ......"

Hua Yu thought that he knew very well which side of the knife's butt was, and who knew that the knife came with a 180-degree longitudinal rotation.

Now the direction is reversed up and down, and both sides are the same.

Huayu, you don't know which side is the ass and which side is the head, right? The body of the icosahedron of the knife without facial features definitely makes you unclear.

"Uh, that, okay."

Hua Yu was blindfolded by a knife and had to admit defeat. When you see his "expression", you can understand what his intentions are.

Hua Yu changed his backpack. It becomes the front carry backpack. Grab the knife in both hands and put it in the backpack, and sit down with one butt. Push with both hands. It's like going down a slide.

Choosing to sit on the straight slide is really a test of courage. The slippery liquid makes the slide faster. It can be called the lubricant of the car, and people are like gears, rolling faster and faster.

Like a cupola in a playground, it feels suffocating at first.

However, it's good to be young, and I got used to it all of a sudden, and that's cool, it's really indescribably fast.

"Ahh

About an hour later, Hua Yu's pocket knife fell into his mouth like a star falling from the sky.

In addition to the large tongue that squirms in the mouth. And the teeth that are hard and tall like mountains and stones, and the ground is full of swamps and rivers that are stained with water.

Huayu is lucky. He fell this time, and landed right in the swamp.

It's a terrifying place, and at this moment, the night here is long, and you can't see your fingers. There are swamps and rivers made of slime everywhere, and white mountains. The sound of the collision between the mountains resounded like thunder in the "earth".

The knife peeked out of the backpack with half of its head exposed. He used his 20-sided head to glow and illuminate his surroundings.

"Master, are there creatures here?"

Hua Yu searched for relevant information in his head. With his memories restored, he is no longer a fragmented material.

"Yes."

Hua Yu paused for a moment and continued: "There are many Streptococcus mutans living on those white mountains. ”

Knife asked with great interest, "Are these Streptococcus mutans good or bad?" ”

Hua Yu sneered: "What do you want to do?" ”

The knife said angrily: "Eliminate harm for the people, save the dead and help the wounded." Eliminate human diseases and help the perfection of health. ”

The knife learned quickly, memorized all the oaths, and learned to use them.

"This can be there. It's a good idea. ”

Hua Yu didn't expect that as a third-year student in the School of Medicine, he would soon become a doctor in stomatology when he majored in surgery.

Although I have also read this knowledge, after all, what I have learned is not this subject, and now it is a bit stretched to use.

"When the book is used, there is less hatred, and it is not difficult to know what to do"

However, he also has a magic weapon on him, that is, a hand card. A hand card is a supercomputer, "omniscient and omnipotent". In fact, it should be said that Internet people know everything and can do anything. The Internet is like a treasure chest, you can generally search for what you want to know and what you need.

Huayu can use a hand card to access the Internet through the 5G + 20 service launched by telecom operators, that is, mobile data networks. Search for information about Streptococcus mutans.

Hua Yu said: "Kiss, Lancet, please help me search for information about Streptococcus mutans." ”

The hand card quickly helped Huayu search for relevant information.

"Streptococcus mutans is a gram-staining positive coccus, one of the largest streptococcal genera in the natural oral flora, and is one of the main components of dental plaque."

Hua Yu: "It seems that this is the precursor to tooth decay." ”

Huayu continued to look down.

"Caries is a bacterial infection that occurs in the hard tissues of the tooth and has the highest incidence among oral diseases. Streptococcus mutans is the main pathogen of caries, and its transmission mode is diverse, mainly including maternal transmission, paternal transmission and other lateral transmission modes. ”

Hua Yu: "This damn Streptococcus mutans, I must destroy you when I see you." ”