The campus is full of life in June, with willow and osmanthus trees lining the main road leading from the gate to the playground, and in the center of the flower bed, a huge banyan tree rises to the sky, as if you stand underneath, as if the whole sky is covered.

This is one of the landmarks of Crape Myrtle High School.

It is said that the tree is more than 60 years old and has been standing here since when the school was not a school, and the three six-story school buildings of Crape Myrtle High School are built around it.

In the past, during recess, students could see the tree through the window, and the full green color could greatly relieve eye fatigue.

In front of School Building 3.

The two small figures had just stepped out of the shade of the big banyan tree, and the sun shone on them again, and the temperature around them suddenly rose again.

Chen Du reached out and touched his waist, and with a sudden, there was an extra plastic parasol in his hand, covering himself and He Ying beside him.

The light-transmitting plastic is used for shading, and the effect is naturally not very good, but the next moment, from the position of Chen Dui's right hand holding the handle of the umbrella, slowly climbs up a layer of fluid with a metallic luster.

This fluid went all the way up, and soon climbed all over the entire surface of the umbrella, as if a layer of silver had been plated on the plastic umbrella.

The temperature under the umbrella seems to be a few points lower, at least there is no longer direct light.

"If you use this trick to seduce girls, the success rate must be very high."

Although she had spent a lot of time with Chen Du, He Ying would still be surprised by his various methods.

"Thank you for the compliment, I will keep up the good work." Chen Du said modestly.

……

June 22.

The third day of the fifth lunar month.

Good to go.

Chen Du and He Ying went out in the morning, and it has been more than four hours now.

It has been four full days since the last time it was attacked by a middle school.

During these four days, the wind and waves were calm.

But everyone knows that the days of Qiming and comfort have come to an end.

It's not a pleasant thing to be found in the base camp and in a hostile place.

However, according to Tang Jing's analysis, in the short term, without a significant increase in the strength of the other party, the First China will not rashly launch a second attack, because they currently do not have a good way to deal with Qiming's grenades.

In addition, with the more powerful Qingbei as a containment, No. 1 Middle School did not dare to attack them with all its might.

But taking precautions, Dong Junwei still wants everyone to come every day as the day before the war.

As a strategically significant lookout, because of the assistance of the clockwork device, the efficiency is greatly improved at this time, and there is no longer a need for Lu Liangliang's brothers and sisters to control it in real people.

Of course, Wei Dalei's workload is a bit larger.

Every night before going to bed, Lao Wei would come to the plastic box by the door, insert the wrench into the hole, and wind it to make a gala sound.

Although this clockwork device is only experimental, and the design and workmanship are far from the effect expected by Tang Jing, it is better than the large volume, dozens of coils of spring springs, once wound, can be used for three days normally, but Lao Wei will still come to the winding once a day, for fear that it will not be enough when there is a war.

However, there are still many problems that need to be improved in this automatic elevator device, and the biggest trouble is that there is no lubricating oil.

The operation of mechanical equipment is often inseparable from this inconspicuous thing.

Even a mechanical watch must be oiled regularly, otherwise there will be problems with the needle and service life.

Chen Du and He Ying, this time they came with a mission.

The goal is clear, which is to find engine oil, that is, engine lubricant.

After all, without oil, the clockwork mechanism can still operate, but the friction of each component is greater, which affects the operation efficiency and service life.

Even if it is just a simple lift, its clockwork mechanism is very complex, in addition to the most basic spring, there are more than a dozen large and small bearings and gears.

Chen Du admits that if he were to design it himself, he would probably spend a few months and only build an inefficient, ugly and inferior thing.

Fortunately, Tang Jing is here.

Chen Du only needs to process the parts one by one according to the dimensions she gave, and finally install and fix them one by one with the help of Wei Dalei.

But the lubricant problem could not be solved.

Eventually, Chen took the initiative to take on the responsibility of going out to find lubricants, and also thought that it would be best to find some practical materials.

However, lubricant is not cooking oil, and there are probably very few such things on an average high school campus.

However, Tang Jing directly pointed out a way for Chen Duan.

School Building No. 3, 4th floor, west side.

It was the office of the teacher of the labor technology class.

In the minds of both teachers and students, this is a dispensable course.

However, after the reform of the education system in the commercial market, physical education and labor technology courses are the two biggest beneficiaries, especially the latter, which was retained all the way from junior high school to high school, and persisted until the first half of the third semester of high school.

As a student, my interest in this course has always been very high, because in class, the teacher will provide materials for everyone to do by themselves, modeling, paper cutting, assembly, and even playing with mud.

The labor technology teacher's surname is Wan, and he enjoys an office alone, mainly because he needs to use too many materials, and there is no place for others to stand.

However, for Chen Du, the most troublesome thing is that the office that Tang Jing said must have lubricating oil is on the fourth floor.

At first, I thought about how the people upstairs should save themselves and how to solve problems such as food, but it didn't take long for me to go up.

The reason why I only brought He Ying here is because the goal is very clear this time, and when I get something, I will come back, and it is easy to be exposed when there are too many people.

"Are you sure you have all the things you need?" He Ying stood with Chen Du as much as possible to block the sunlight to the greatest extent.

"Of course, what's wrong?"

"I'm worried about whether there will be so many kinds of lubricants over there in Mr. Wan."

According to Tang Jing's instructions, the two of them needed to get as much lubricating oil as possible from the office on the fourth floor, but the lubricating oil and lubricating oil were also different, there were different brands, different models, and there were three kinds of Tang Jing's explanations alone.

A high school handicraft teacher, will not be so professional, put so many different kinds of lube in the office.

But since Tang Jing said so, it shouldn't be wrong.

Always go first and then talk about it.

The classroom where Class 4 is located is located on the east side of Building 1, so it is the closest to the cafeteria, and it is only 70 meters away.

But Building 3 is different, the distance is more than double, and you still need to pass the big banyan tree.

It took them nearly an hour just to walk from directly under the banyan tree to the No. 3 teaching building.

Now it's finally here.

Come closer.

Chen Du glanced up at the 30-centimeter-high steps outside, and suddenly sighed.

He pointed obliquely at the height and asked He Ying, "You jumped up there all at once?" ”

"What's wrong?"

"You may need to do it again."

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