"I'm afraid you won't be able to adapt to the soil. Lin Xiyan looked at her with concern and said.

"We have been here for more than a month without any discomfort. Hua Banzhi patted his chest and said, "There is an discomfort that makes you feel." ”

"Hehe......" Lin Xiyan shook his head and laughed when he heard this, "If I don't cook you and Guangming, you won't drink it." Looking at him accused.

"We're in good health, it's okay if we don't drink it, why don't we force us to drink medicine!" Hua Banzhi pouted in disgust.

"Yes, yes. Zhou Guangming ran out of the house and said.

"I'm boiling sweet. Lin Xiyan looked at the two of them and said.

"There's medicinal herbs in it, and it's not sugar water. Zhou Guangming pouted and said, at first he really thought it was like sugar water, and he choked him enough by pouring it in.

"When I come back and stew all kinds of soups, I will put some herbs to ensure that there is no taste, and I don't need to make herbal tea. Hua Banzhi looked at him and sighed...... "Drinking hot soup on such a hot day is really like taking a bath." ”

"You're sweating unconsciously, you're taking a shower, and you're very energetic. Lin Xiyan looked at them and smiled unkindly.

"It's only June now, and we haven't been ambushed yet! I really don't know how you're going to survive in the next three or four months! Hua Banzhi looked at him and sincerely asked for advice.

"That's it! When it's hottest, I can't wait to jump into the river and don't come out, and I don't realize what's wrong with it? Isn't summer supposed to be hot? Can it still be called summer if it's not hot?" Lin Xiyan said with a smile as he looked at the two of them.

"To say it is to say nothing. Hua Banzhi stood up and said, "Let's go, it's time for me to go to class." Looking at Zhou Guangming, "Guangming, you're at home! It's hot outside." ”

"Then I won't send you off. Zhou Guangming looked at her and said embarrassedly, "I won't increase my aunt's burden, I'm tired of riding a car with my mother." ”

"This kid has a sweet mouth. Lin Xiyan looked at him and said, "Watch the door, don't go out and run around." ”

"Hmm!" Zhou Guangming nodded in a hurry, "It's so hot outside, I won't go out!"

Lin Xiyan stood up and said, "Zhizhi let's go!"

Lin Xiyan rode the car to send Hua Banzhi to school, and on the way back, he bought some finger-thick bamboo poles and came back to build a shelf.

"What are you buying bamboo poles for?" He Hongjun said as he shook a fan in his hand and looked at the oncoming Lin Xiyan.

Lin Xiyan got out of the car and looked at him and said, "Build a shelf for the dishes." ”

"My younger brother and sister really don't change the true colors of working people. He Hongjun turned around and looked at the flowers and trees in his yard, "I don't have time, I have time, and I have a whole vegetable garden." ”

"Let's go, your house is cool. He Hongjun looked at him and said.

The two went back to Lin Xiyan's house, and Lin Xiyan unloaded the bamboo pole from the car and put it under the corridor, and the car was supported under the corridor.

Lin Xiyan watched He Hongjun change into slippers and dragged him into the living room.

"What is Guangming writing about?" He Hongjun walked in and saw Zhou Guangming lying on the table of the Eight Immortals.

Hearing this, Zhou Guangming stood up and looked at the comer, "Uncle He." I'll write big characters!" Lin Xiyan, who looked at him behind him, said, "Uncle, you sent your mother back." ”

"Hmm!" Lin Xiyan looked at him and said, sitting at the table of the Eight Immortals, shaking vigorously with a pu fan.

"Xiyan, I envy your house, it's much cooler than my house. He Hongjun sat down, shook the pu fan and said, "I didn't expect the summer in Lingnan to be so hot." ”

"It's hot all over the country in the summer. Lin Xiyan looked at him and said.

"It's hot and humid here, and it rains, and it's wet every day. He Hongjun said in disgust, "Look at the sky outside again, it's cloudy again, and it's not cool when it rains." ”

"You're here to complain about the weather. Lin Xiyan picked up the teapot on the table, turned the upside-down teacup over, and poured two cups of water.

"Give water. Lin Xiyan pushed the glass in front of his eyes.

"Uncle, Uncle He, I'm in, you talk. Zhou Guangming got up and left with a notebook and pencil.

"Go ahead!" Lin Xiyan said with a gentle look at him.

He Hongjun watched Zhou Guangming leave, retracted his gaze and looked at Lin Xiyan and said, "Oh! This kid is really eye-catching, a little greedy. ”

"It's someone else's child. Lin Xiyan snorted lightly.

"Stinky beauty! There is one more word between this aunt and father. He Hongjun said unconvinced.

"Are you angry with me?" Lin Xiyan said as he looked at him.

"I'm here to apprentice. He Hongjun looked at him and said, "You said at the beginning, I will teach me the knowledge of airplanes and flying when I come back." ”

"Then let's get started!" Lin Xiyan took two sips of the water glass and said, "Did you bring a pen and paper?"

"Brought it. He Hongjun took out a pen from his chest pocket and a notebook from his trouser pocket, "Okay, let's start!"

"Before the lecture, can you tell me why the plane can fly?" Lin Xiyan looked at him and asked.

"Isn't this simple? Isn't it the engine, it's the engine!" He Hongjun said casually.

"According to your theory, you can fly if you run fast, and the car also has an engine, why can't it go to the sky?" Lin Xiyan looked at him and said.

"This ...... That ......" He Hongjun hesitated for a long time, and then simply said, "How do I know this? It's like a pistol, I can just shoot it, I'm the target ten rings. It has to be said that the principle of firearms is not successful. ”

Lin Xiyan really convinced him, "You are really strong words." Looking at him, he said seriously, "Big brother, you are the head of the airport, others can be forgiven if you don't know, you can't not know!"

"Okay, okay! I'm not going to come to ask you? He Hongjun looked at him with a smile and said.

Lin Xiyan looked at him and considered his language for a while and said, "To put it simply, when the plane takes off, it relies on the thrust and pull generated by the engine, so that the plane produces a huge forward speed when it is taxiing, and then the wings will generate a certain amount of lift, so that it will fly." ”

"Wait a minute, wait a minute, you say slow down, I can't keep up. He Hongjun said loudly, the pen in his hand rustling on the notebook.

Lin Xiyan waited patiently for a while, watched him finish writing with a fan, and said as slowly as possible, "Another reason why the plane can fly is that the wing of the plane is specially designed, when the air flows through the surface of the wing, it will generate pressure above and below, but the pressure above is relatively small, and the pressure below is a little larger, which is enough to support an airplane." There is a kind of air flow in the atmosphere, and the wings produce a new force by this relative air flow, plus the engine of the aircraft uses oxygen in the air as an oxidant, so that the fuel can be burned to produce propulsion, so the plane can fly. ”

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