Feeling the train start, An An felt very magical, "Mom, how does the train move when it is so long? It's amazing."
Song Shuqian explained, "This involves mechanical principles. Trains are mainly pulled by internal combustion engines or steam engines. This is a very complex and precise process. Maybe you will understand it better when you are a little older.
If you still want to know at that time, you can ask your mother and I will draw you the schematic diagram of the internal combustion engine.
Now, let me tell you a little bit.
If you look at the locomotive and it is smoking, it is because it is powered by coal. There are several boilers on the train and when the water inside exceeds a certain temperature, it will produce steam. This steam will become power through some processes and propel the train forward.
Water vapor is very dangerous, you should stay away from it. If you want to know more, you need to be accompanied by your mother. This is very important, An An.
If the locomotive doesn't emit smoke, it's running on fuel. It's not the kind of oil we eat, it's the kind of oil my dad puts in his car when he drives. Also through a very complicated process, it becomes the driving force that drives the train forward. "
Lele is very interested in trains. "Mom, why doesn't this train shake?"
"Le Le, this question is very good, which shows that you usually observe carefully. An An's question just now is also very good. Mom forgot to mention it just now, so I will make up for it now.
However, this is also a very complicated issue, involving many disciplines, which is not something you can understand now. You can also write it down first.
Mom will explain it to you briefly first. When you say "not shaking", are you comparing it to when dad drives a car or when mom rides a bicycle? "
"Compared to a car."
"Okay, let's compare it with cars. First of all, trains run on tracks, and the tracks are laid by many uncles and aunts after very precise measurements, and they are very flat. Just like when we drive on a road that has been built, the car will not shake.
Secondly, the train is very heavy and long, like a giant steel dragon. Such a heavy train will generate inertia when moving, which will keep it as stable as possible.
Finally, it’s the speed. The speed of a train is generally very stable and will not suddenly accelerate or decelerate.
That’s basically it. If you are still interested, when we get home we can think about whether we can make a small model and experiment with it. "
"Interested", "We want a model". Lele's voice was a little loud when he was excited.
"LeLe, keep your voice down, you're disturbing others."
"Sorry," Lele fell silent in an instant.
"To add, this requires Dad's help. As you know, Mom is rich in theoretical knowledge but has zero practical skills."
Tiantian swallowed her saliva, "Sister, is this how you usually play with your children?"
"Yeah, we can also let them go and play by themselves. Lightning and Moying will take care of them."
Tiantian gave a big thumbs up, "No wonder you don't want to send your child to a nursery. Which teacher can answer such a complicated question?"
Song Shuqian was rarely proud, "This is how my elders educated me when I was a child."
The guy on the upper bunk, who accidentally heard it, nodded vigorously in his heart, wondering who teaches their children like this.
If he asked so many questions when he was a child, he would get a response: I don’t know, go ask the teacher yourself.
It’s true, same world, different mother.
The old comrade's eyes lit up as he listened. This female comrade is amazing. I wonder what kind of job she does.
Lele lay on her mother's lap, "Mom, I'm sleepy."
Song Shuqian touched his head and said, "Go to sleep if you are sleepy. Mom is here, it's safe. Call your brother to come over, hold hands and sleep together."
Lele was very well behaved. He went over and pulled Anan over, gave him a bear hug, and the two little brothers lay down together.
"An'an, you guys got up too early this morning. Go to sleep for a while. Mommy and Auntie Tiantian are not sleepy, so she will accompany mommy."
Just sleep, close your eyes, and fall asleep in seconds.
Tiantian gave Song Shuxi a thumbs up and said, "Your An An is so thoughtful."
Song Shuqian rolled her eyes at her and said, "Don't be ungrateful for what you have. Your Sihu is also a great little baby."
Tiantian said happily, "Of course, our Sihu are the best in my heart."
When the two saw that Sihu had completely closed his eyes, they smiled at each other.
When they praise their children, they mean it.
The uncle on the upper bunk also closed his eyes and went to sleep. He thought these two lesbians were really interesting. Normally, shouldn’t they give way to each other, praise each other’s children and belittle their own children?
The two of them seemed to be competing with each other.
For a moment, the carriage fell silent.
Song Shuqian signaled Tiantian to go to sleep first, and she mouthed, "I'll watch over you."
She took out a notebook in which she had recorded the children's questions and her answers when she was bored.
Song Shuqian has come into contact with children from housing compounds and has also met children from nurseries, and many of them are very smart.
She wanted to wait until the environment was better, integrate these things together, and publish an encyclopedia for children.
Parents who want to answer their children's questions but don't understand the answers themselves can find the answers in the book.
They slept for a long time, and when they woke up, it was almost time for dinner.
Sihu was the first to wake up. Song Shuqian stretched out her arms, "Sihu, auntie hold you, let mommy sleep a little longer, okay?"
Sihu was held by Song Shuqian obediently, "Auntie, I want to pee."
"Okay, auntie will take you there, we have to wake your mother up."
Tiantian is already awake. She wakes up as soon as Sihu moves, but she is just too lazy to move. "I'll take him there."
Maybe there is some magical connection between children. As soon as Sihu and Tiantian left the box, An An woke up and said, "Mom, I need to pee."
Great, we all want to do the same thing.
As soon as Tiantian came back, Song Shuqian quickly took Anan and Lele to the bathroom.
The management of soft sleeper trains is quite strict and people without tickets cannot enter. It is relatively safer and cleaner.
After solving the problem with the two children, I met the flight attendant Xiao Wang who came to deliver meals.
"Comrade Song, this is your dinner."
Everyone in the carriage woke up.
Song Shuqian asked the two children, "Are you hungry? How much can you eat?"
Both children said they were not hungry.
"How about some dumplings? I packed them for lunch, dumplings stuffed with mantis shrimp."
Song Shuxi took out their exclusive tableware, wooden bowls and spoons, and placed five dumplings in each bowl.
"Eat. If it's not enough, ask mom for more."
The old man and young man above were stunned. This kid was only two or three years old, but he could communicate with people like an adult.
Tiantian scooped a large spoonful of chili, mixed it, and asked Song Shuqian, "Do you want some?"
Song Shuqian shook her head. She couldn't bear it.
They had just finished their meal when a flight attendant came over to bring food to the old and young comrades.
Song Shuqian and Tiantian cleared the things on the small table to make room for them, "You guys can eat here."
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