Chi Sui took a deep breath and suddenly asked, "Did you make this?"
Long Xi still spread his hands: "Gold."
Chi Sui rubbed his scraped instep: "Can I not give you the gold?"
Before Long Xi could strike her, Chi Sui raised her hands in surrender: "I've discovered a little bit of optimization for this water pipeline."
Long Xi looked at Chi Sui intently, then suddenly withdrew his hand: "How do you know this was made by me?"
Chi Sui scratched his wet forehead and said, "Because you didn't interrupt me when I mentioned this thing, and you agreed when I suggested going into the water to take a look."
Long Xi raised an eyebrow, the cinnabar mole at the corner of his eye adding a touch of softness in the moonlight: "What do you mean by optimizable?"
Chi Sui squatted down and pointed at the pipes: "Have you ever thought that the structure of this castle is very symmetrical?"
"There are four rooms on each floor, from left to right."
"That is to say, from the first to the fifth floor, five rooms from top to bottom can share one pipe."
Long Xi frowned. "If the same pipe is used by several rooms above and below at the same time, the water flow will decrease. In this case, the pipe at the bottom needs to be widened. But I've tried it before, and if the pipe is widened, the water can't be pumped up."
Chi Sui looked at Long Xi deeply and said, "You made this pipeline by utilizing the pressure and vacuum structure."
"If the vacuum seal is good, water can be pumped up even if the pipe is larger."
Long Xi tilted his head slightly: "Although I don't know what you are saying, I can probably understand it."
"What if I say that this world doesn't have such materials?"
Chi Sui shrugged: "I'm not talking about materials."
Long Xi frowned: "What is that?"
Chi Sui nodded, revealing a row of small white teeth: "Air check valve."
Long Xi thought for a moment, then suddenly reached out and pressed on Chi Sui's eyes, and a purple air penetrated into Chi Sui's eyes.
"Now, look at the pipes in the well."
Long Xi pointed to the well. Chi Sui looked into the well and a magical scene happened. The water became very transparent in her eyes and she could even see the internal structure of the water pipe in the well.
It was a magical experience. Long Xi waved his hand, and the water pump on the balcony started moving by itself. The gears inside the pumping pipe started running, and Chi Sui saw the entire operating principle very clearly.
About five minutes later, his eyes returned to normal. Chi Sui turned around in a daze and looked at Long Xi in shock.
What the hell?
What are those densely packed gears inside?! She can't understand it!
"Are you the descendant of Lu Ban?"
Chi Sui swallowed and asked.
Long Xi frowned: "Who is Lu Ban?"
Chi Sui waved his hands and sighed: "Okay, actually what I'm telling you is not a structure."
"It's the same principle, but the parts used are completely different. Yours relies solely on parts to operate, which is amazing."
Long Xi frowned: "Since you can't explain it, then give me gold."
Chi Sui quickly waved his hands: "Wait, maybe you are interested in the parts and principles in my brain?"
So Chi Sui followed Long Xi to the hall of the main castle.
In Long Xi's study, Chi Sui spent the whole night explaining to Long Xi the basic principles of modern water presses.
Long Xi silently looked at the structural diagram drawn by Chi Sui on the paper: "So, the key is the air check valve you mentioned?"
"Yes."
"oh."
Long Xi had no expression on his face, and it was hard to tell whether he was interested or not, but he didn't mention asking Chi Sui to give him gold as a reward for saving his life.
Chi Sui, who hadn't slept all night, and Mary Ellie, who hadn't eaten all night because she was worried about her, went to the kitchen with dark circles under their eyes and worked hard.
Chi Sui and the other two were only responsible for cooking, while Prime Minister Turtle and the witch were responsible for carrying the dishes out.
It is said that there are no servants in the Demon King's castle. On special days, the witch and Prime Minister Turtle are responsible for running errands.
The last dish served was Dongpo pork.
After finishing everything, Chi Sui was exhausted.
I feel sleepy, hungry and tired.
Prime Minister Turtle poked his head out of the doorway and said, "Lady, my Highness invites you to a banquet."
Under the worried gazes of Mary and Ellie, Chi Sui followed Prime Minister Turtle to the banquet.
Chi Sui arrived late, and Long Xi was already there.
She was located very close to Long Xi, and at a certain distance from other monsters.
The table is also separate.
She sat at the same table with Prime Minister Turtle.
The monsters collectively transformed into human form. Although they still had the characteristics of monsters, they looked very similar.
A monster at the table next to him tugged at his clothes and said to his companions, "Oh, oh, I'm not used to wearing clothes all of a sudden..."
"By the way, have you learned to use chopsticks?"
"I learned it, but it's so difficult..."
"Hey? Why do you smell? Didn't you wash before coming here?"
"It smells?! No way! I've been washing with fragrant fruit all day, how come it still smells?"
"It's over. What if His Highness smells it and loses his appetite?"
"I'm not going to get beaten again, is it? Wuwuwu... Your Highness's beating really hurts, wuwu..."
"It's okay, it's okay... Hey, this food smells so good! It looks delicious!"
"Really? Then you help me watch, I will take a sip when His Highness isn't paying attention."
"Hey, no, His Highness said we can't eat until all the guests are here!"
"How could they not be here? Look, isn't that Countess already here?"
"Indeed, can we eat now? I'm so hungry."
There was a lot of noise at the table, and Long Xi, who was sitting at the top, was so annoyed that he twisted the red gem off the armrest of the throne and smashed it to the ground with a bang.
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