In fact, as early as Bai'er's appearance, Zhang Nan saw that Bai'er's eyes were a little different, because his eyes always gave people a vague feeling, and it was obvious that it was astigmatism. The eyes that are not focused must look more blurry, and when Bai Er looked at the steam train he built, Zhang Nan obviously saw that Bai Er had put his whole face up, so Zhang Nan was very sure that there must be something wrong with Bai Er's eyes.

"You, how do you know I have an eye disease?" Bai Er was a little surprised, although he had eye diseases that everyone in the Mo family knew, but Zhang Nan was just an outsider after all, and it was the first time they met, Zhang Nan said his eye disease in a word, which really surprised Bai Er.

"The Buddha said, don't say, I'll ask you if you gamble, I'm sure it's your clever work that has a problem." Zhang Nan shook his head with a smile and said.

"I don't believe it, my ingenuity is absolutely no problem, you say there is a problem, you prove it to me." Bai'er still doesn't believe that there will be problems with what she makes.

"If you don't believe it, okay, you can activate this thing now, and I'll find the problem for you right away." Zhang Nan said with a smile, but although Zhang Nan said so, in fact, Zhang Nan still had some bottom in his heart, although Zhang Nan could be sure that there was something wrong with this thing, but whether he could find it or not, it would be a matter of two things.

Mo Zu also wanted to know what the problem of this Karakuri not being able to run fast was, so he called Ah Da Ah Er and said, "You two, go find some charcoal." ”

It didn't take long for Ah Da and Ah Er to each carry a bag of coal to Mo Zu.

Without waiting for Mo Zu to speak, Bai Er began to stuff coal into the machine herself.

"No, don't you use something to lead the coal inside? How do you light a fire when you're all stuffed? I can't burn this amount of coal. Zhang Nan looked at Bai'er, who was stuffing coal into the boiler, and said with a strange face, didn't she make this steam engine? Why can't you even make a fire?

"You don't have to." Bai Er said viciously, and after speaking, he continued to stuff coal into the boiler, and after a while, the coal in the boiler was stuffed all the way to the mouth of the furnace.

Bai Er saw that it was almost enough, so he ran to Mo Zu's room, and after a while, he took out a gourd, opened the gourd bottle, and Bai Er put the contents of the gourd into it.

Although Zhang Nan had never seen what oil and crude oil looked like, when he saw the black, bright and very viscous liquid, Zhang Nan quickly thought of oil.

"Eh, I said Bai'er, you don't have to pour so much, what a waste of this, you don't know how much effort I wasted to find such pure oil." Mo Zu said with a look of regret.

Bai Er obviously ignored Mo Zu, but took out a fire fold from his waist, and quickly poked the fire fold towards the coal that had been soaked in oil, and the fire immediately ignited.

The ignition point of crude oil is not high, and the fire starts before the fire breaks into the coal.

Seeing that the fire was lit, Bai'er glanced at Zhang Nan provocatively, and Zhang Nan had no choice but to ignore it.

In a short time, the water in the tank is heated to a boil. Steam leaked out of the tank. When Zhang Nan saw this, he already knew in his heart that the problem with this thing was there.

The sealing of the gas tank of the steam engine must be good, otherwise the steam will disperse before it comes and pushes the machinery, not to mention the power, it is not easy to push this thing up.

"Alright, I know what's wrong, if you listen to me and improve, make sure this Karakuri can run fast." Zhang Nan arrived.

"Oh? Qingquan: You found out the problem so quickly? Old man, I have been looking for a long time with the people of Momen, but I haven't found the problem. Mo Zu obviously didn't expect Zhang Nan to find out the problem so quickly.

"Of course, this problem is actually very simple, the problem is on this gas tank, the steam engine is powered by steam, but this steam from the beginning of water boiling to it began to work, it has long been scattered, the sealing of this gas tank is too poor, the steam has run out, so the machine can't run fast, it is also a very normal thing." Zhang Nan arrived.

"This ...... But it has taken a long time to build this gas tank, and this gas tank is already the best that Bai'er can build, and we really have no choice. Mo Zu spread his hands and said, obviously Mo Zu also tried his best.

"Oh? Will you still strike iron? Zhang Nan didn't expect that a woman who looked soft and weak could actually strike iron, shouldn't it be appropriate for a man like Ah Da to strike iron?

"Don't underestimate me, I can strike iron, and my skills are the best in the ink gate, for me, everything made of iron is my good friend." Bai Er said with a serious face.

"Oh, congratulations, your friend is leaking." Zhang Nan said expressionlessly.

Obviously, Bai'er's seriousness was not exchanged for Zhang Nan's seriousness.

"You ......" After Bai Er heard this, she was so angry that she didn't know what words to use to slap Zhang Nan back.

"Okay, okay, Qingquan, you don't have to joke with Bai'er anymore, can you find a way to solve this gas tank leakage problem." Mozu asked.

"Well, to be honest, I don't know much about iron, so I definitely can't improve the technology of iron." Zhang Nan spread his hands and had no choice but to tell the truth.

"Look, Ancestor, I'll just say that this person will definitely not be able to do it, you ask him what he is doing, or give me some time and let me solve this problem." Bai'er snorted softly.

"I can't?" Zhang Nan pointed to his nose with a finger, Zhang Nan now wanted to go up and pat Bai'er on the shoulder and tell her, man, you can't say no.

So Zhang Nan put his hands around his chest and said: "Although I can't strike iron, I can make a well-sealed gas tank, unlike some people, if she studies the gas tank, it is estimated that I will wait until my hair is gray." ”

"You ......" Bai Er pointed at Zhang Nan with his hand, and was about to say something, but suddenly Bai Er thought of something, and said instead: "Okay, didn't you say that you can make a good gas tank?" Then you can take one out for me to see, and if it's really better than mine, then I won't say anything. ”

"If you can't make it, hum." Bai'er's yin and yang are weird.

"What if it doesn't work?" Zhang Nan asked rhetorically.

"If you can't, if you can't...... I haven't figured it out yet. In the end, Bai'er still didn't think about what she would do if Zhang Nan couldn't do it.

"Okay, you don't have to spend your brain, what I took out must be okay." Zhang Nan said.