Transmigrated into a female county magistrate during a famine, leading her country to prosperity

Yu Shizhang and Yu Zhengqing listened quietly to Shen Zheng's explanation.

What a wonderful “electrical signal,” what a wonderful “antenna,” what a wonderful “hand-cranked generator.”

They recognized each word individually, but when these words were put together, they became illiterate.

Should we say that Shen Zheng is "well-informed" or that they are "ignorant"?

"...Lord, Uncle, I'm back now." Shen Zheng's voice came from the small black block again: "If you have any questions, you can think them over first, and I will answer them all when I get back."

Yu Zhengqing was somewhat numb, as was Yu Shizhang.

Despite Shen Zheng's repeated insistence that the matter was "unrelated to ghosts and gods," they still couldn't understand how a person's voice could be transmitted from one object to another.

They were eager to see Shen Zheng.

Before long, the office door opened.

Shen Zheng's shadow appeared on the ground. The next moment, the shadow moved. After Shen Zheng came in, she turned around and closed the door.

Seeing that she was unharmed, Yu Zhengqing and Yu Shizhang both breathed a sigh of relief.

......

"..."

"..."

"So, walkie-talkies need electricity to work. This 'electricity' is the 'electricity' of lightning, but it's much weaker than lightning. You can get it by simply turning the crank, and it can be stored?"

"Yes."

"But we're cranking a wooden handle, so where does the electricity come from?"

"It's like a water millstone. The water power, through the gears, becomes the force that propels the millstone. Do you understand?"

"Yes... I guess so. It's like the force we exert in our hands, through the gears inside the walkie-talkie, is converted into 'electricity'?"

"Indeed, you two are very intelligent. Do you have any other questions?"

"Have."

"please say."

"Is the furthest distance we can communicate using walkie-talkies a hundred paces?"

"Do not."

"How far is that? It can't be two hundred steps, can it?"

"It can be a little further."

"Give me the answer!"

"Ten li, as the crow flies."

"How many?!"

"Ten li. That means you two can walk straight back now, and you'll probably reach the fork in the road with the 'Ten Li Liuyang Post Station' monument. We should still be able to talk then."

"Zizzi-"

"Hello? Uncle? Master? Father?"

"Zizzi-"

"Hello? Is the signal bad?"

"Ten li—! Buzz buzz buzz—Oh, Father, don't grab it! This walkie-talkie is for your son, Shen Zheng! Shen Zheng, Shen Zheng, don't, don't joke with us! Do you know how far ten li is?"

"Of course, but the walkie-talkie can indeed cover a radius of ten miles, and it can connect many to many."

"What do you mean?"

"Wait a moment," Shen Zheng said.

Outside the back door, Yu Shizhang and Yu Zhengqing squatted under a big tree, holding walkie-talkies like thieves, their eyes warily scanning their surroundings.

After waiting for a while, no sound came from the walkie-talkie.

Yu Shizhang, slightly flustered, snatched the walkie-talkie from Yu Zhengqing's hand, pressed the "talk" button, and said, "Hello, Shen Zheng, what happened? We're coming back right away!"

"Buzz—" came the busy signal in response.

Yu Shizhang frowned, about to get up, when the walkie-talkie rang.

Two identical voices came almost simultaneously: "Hello, hello, hello, Shen Zheng is calling, Shen Zheng is calling, can you hear me?"

"Two voices?" Yu Shizhang immediately thought of the other walkie-talkies in the case. As if struck by a sudden inspiration, he pressed the "talk" button and said, "Shen Zheng, Shen Zheng, are you using two walkie-talkies at the same time?"

"Yes, yes." Soon, two repeated voices came again: "Do you remember when I turned the top knob at the beginning?"

"I remember, I remember!" Yu Zhengqing snatched the phone from Yu Shizhang's hand and excitedly answered, "It's 'one'! Both walkie-talkies said 'one'!"

"That's right!" Shen Zheng's voice came again: "This is called a 'communication channel'. Only intercoms in the same channel can communicate with each other. Please come back quickly, I will teach you how to set up the channel."

After he finished speaking, Yu Shizhang and Yu Zhengqing exchanged a glance, but neither of them replied.

After a while, Shen Zheng's puzzled voice rang out: "Hey? Are you heading back?"

"Ahem—" Yu Shizhang coughed lightly, picked up the walkie-talkie, and while picking at the bark of the tree, pressed the "talk" button and said, "Hey, Shen Zheng... just teach us like this, we can learn it."

"What do you mean?" Shen Zheng's questioning voice rang out again: "You two don't want to come back? You're planning to run away with the plane?"

Yu Shizhang blushed and handed the walkie-talkie to Yu Zhengqing.

Yu Zhengqing hurriedly pressed the "talk" button, propped his neck up, and said, "Nonsense! What do you mean by the rolling machine running away? What would we need a walkie-talkie for? Don't you need at least two of these to work?"

“Yes.” Shen Zheng’s confused voice came through: “So what are you two doing… Oh—I understand, you want to play a little longer? Okay, I’ll wait for you inside the office. Let’s keep in touch, and when you come back, I’ll teach you how to adjust the channel.”

"Keep in touch..." Yu Zhengqing held the walkie-talkie, flipping through it several times until his eyes narrowed into slits with laughter: "Father, this thing Shen Zheng gave me is truly amazing. It can keep us in touch within ten miles. Sigh... No wonder Shen Zheng treats me so well. If I weren't going on a long trip this time, she definitely wouldn't have been willing to give it to me."

Yu Shizhang felt a surge of bitterness in his heart and gritted his teeth as he walked towards the ridge behind him.

After walking along a muddy path, he became increasingly dissatisfied and suddenly stopped in his tracks.

"If I'm going on a long trip in the future, Shen Zheng will definitely take it out for me to use, otherwise... why didn't she avoid me today?"

"Yes, yes, yes." Yu Zhengqing replied perfunctorily, then pressed the "call button": "Hey, Shen Zheng, the scenery behind the post station is quite nice, do you want to come and take a look?"

Yu Shizhang glanced around.

It's just vegetable gardens, nothing but vegetable gardens. I don't know what's so "good" about the scenery.

"No, you two can continue browsing. I'm writing the instruction manual." Shen Zheng paused for a moment, then added, "I've annotated the function of each button and knob. You can explore on your own once you set off."

Upon hearing this, Yu Zhengqing smiled and looked up at Yu Shizhang, saying, "Look how thoughtful Shen Zheng is."

"..." Yu Shizhang was so angry that he walked another half mile with his head down.

Seeing that they were getting further and further away from the post station, he finally stopped and gestured to Yu Zhengqing with his chin, saying, "Let's see if we can still make a call here."

Yu Zhengqing, whose mouth was itching to speak, immediately pressed the button upon hearing this: "Hello, Shen Zheng—"

"Yes, please speak," Shen Zheng replied quickly.

Yu Zhengqing suppressed his laughter and said in a calm tone, "We'll be back soon."

"Okay, I'll wait for you," Shen Zheng said.

The father and son chose to return the way they came. Before they even reached the back gate of the post station, they saw several fine horses galloping toward the post station from the southeast official road.