"Wang Xingguo, what are you doing?" Xia Ruobing saw Wang Xingguo take out a medical hose from the medical bag, then dismantled the aluminum tube of the backpack, and bent the aluminum tube with his hands, and the aluminum tube was bent into a U-shape, and he took the U-shape and drew it on the platform.

"Slingshot!" Wang Xingguo replied simply, and cut a small piece of canvas from the medical bag with a knife.

"Slingshot?" Xia Ruobing looked at him strangely, when was it, he was still making children's toys!

"Hey, don't move the light, it's done." Wang Xingguo was making a hole in the canvas, Xia Ruobing turned the flashlight to the platform, she couldn't understand what the slingshot had to do with the platform.

"What do you do with slingshots? Bird hunting? Xia Ruobing was a little angry, if she didn't want to go out at this time, what was the use of making a slingshot?

"So what can you do? You can only figure it out from the platform. Wang Xingguo opened the hole, threaded the hose, and tried the tensile again, if the projectile is hit, this tensile force is enough, but with the tow rope, Wang Xingguo feels that it may be a little hanging.

"Hey, do you have any hoses in your medicine bag?" Wang Xingguo asked.

"What are you doing, I have a name, Xia Ruobing!" Xia Ruobing felt irritable, this Wang Xingguo seemed to be fine, and he was making a slingshot with great interest.

"I knew I was asking." Wang Xingguo took the U-shaped slingshot rack, compared the hose to the drawing, and calculated the elastic force.

"What the hell are you doing?" Xia Ruobing seemed to have thought of something.

"It's very simple, to get to that platform, you need a rope, either someone climbs up or you find a way to drag the rope up." Wang Xingguo said, cutting a short section of paratrooper rope and tying the hose to the U-shaped slingshot frame.

"Use this?!" Xia Ruobing pointed to the paratrooper rope, such a thin paratrooper rope, no matter if you can't put on the protector, it will break as soon as you go up! Is this Wang Xingguo reliable?

Wang Xingguo glanced at Xia Ruobing, not wanting to explain the principle to her, the slingshot has been ready, and the next thing is to find a projectile.

"Well, you go find me a stone now, and you want it to be even." Wang Xingguo said, seeing Xia Ruobing turn around, he reminded again, "You can't exceed my line of sight." ”

"Still in sight?!" Xia Ruobing muttered, she was very dissatisfied with Wang Xingguo's command, but now there was nothing she could do, as soon as she lowered her head, she saw a lot of limestone on the ground that had just fallen, and casually picked up a stone that was half the size of a fist and quite symmetrical, and turned back to hand it to Wang Xingguo, "What a complicated thing, find stones, stones all over the ground." ”

Wang Xingguo saw the stone stretched out in front of him, looked up at Xia Ruobing, and was speechless.

"What? Still not satisfied? Xia Ruobing glared at him.

"Hey......" Wang Xingguo sighed, he really couldn't say a word. Xia Ruobing, I need a stone about the size of a thumb, preferably about a circle, use it as a projectile, first throw the paratrooper rope up, and then drag the main rope up, hey, do you see that position? Use there as a fixed point. This blunt way would cause Xia Ruobing to resist emotionally, so Wang Xingguo had to patiently change to a soft tone.

"Won't you just throw this stone at it?" Xia Ruobing looked at a bulge on the platform, the bulge was not big, about less than ten centimeters, it was not easy to drag the main rope there.

"Precisely, I need to drag the rope precisely to that position." Wang Xingguo had no choice but to explain again, at this distance, who dares to guarantee that the stone can be thrown so accurately? Instead of wasting time, make a tool.

"Oh......" Xia Ruobing knew that he was at a loss, so he honestly went to find a stone, and after a while, he grabbed a handful and put it in front of Wang Xingguo, and let him pick it himself.

"Good job...... Wang Xingguo felt that he should give her a little encouragement, at this time mood swings are a terrible thing, he picked the most symmetrical piece, made a rope sleeve with a paratrooper rope, wrapped the stone into the slingshot's slingshot, and checked the paratrooper rope and the main rope under his feet, confirmed that they were all smooth, raised the slingshot, and aimed at a high position.

Wang Xingguo has to accurately shoot the projectile through the bulge, and also to ensure that the rope has to cross the bulge, and when the stone falls, he has to calculate that such a small stone has to drag a paratrooper rope of more than 7 meters, which is 14 meters when doubled, Wang Xingguo must ensure that the projectile has enough speed, and after crossing the bulge, it must be able to drag out a rope of at least 6 meters.

"Smack!" In the first experiment, the projectile hit the stone wall next to it, a little off the target point, but at least Wang Xingguo felt that the speed of the projectile was sufficient.

"Snap" the second time, the projectile was slightly lower, hitting the lower edge ......of the bulge.

Every time he fails, Wang Xingguo needs to retract the paratrooper rope and carefully smooth it, this is not a job that can be done in a hurry, it takes several minutes to come and go, and this angle is very tricky, it is not easy to hit accurately.

"It's been hit......" Xia Ruobing counted, this is already the 19th test launch, Wang Xingguo is still very calm, there is no feeling of anxiety at all, every time he adjusts the impact point according to the situation, and the hit is getting more and more accurate, but it may be an angle problem, there are two ropes over the bulge, but the fall is not long enough, Wang Xingguo can't reach it, there is no way to tear it off and start again, this time Xia Ruobing heard a very powerful "snap" sound when the projectile was launched, and the projectile was like an eye, and it accurately crossed the bulge, Then it bounced on the edge of the cave wall and fell straight down with the paratrooper rope.

But it was still a little bit worse, when the projectile was still more than three meters high from the ground, the paratrooper rope hung on the bulge, Xia Ruobing watched discouraged as the paratrooper rope hung the projectile in mid-air.

"Do you want to do it all over again?" Xia Ruobing was very frustrated, it was already the 20th time, how could this seemingly simple thing be so difficult? If there is no expectation of something, then there will be no disappointment, and this kind of thing that seems to hope that you can succeed as soon as you stretch out your hand but repeatedly fails is the most confidence-destroying thing, Xia Ruobing felt that she had been tortured by this paratrooper rope and projectile to the point of going crazy.

"Oh, when you are trying to survive, there are a lot of things that you have to experiment with, and it takes a little time, so don't be in a hurry." Wang Xingguo comforted, looked at the height of the projectile from the ground this time, at least much lower than the previous two times, and suddenly asked, "Xia Ruobing, how tall are you?" ”

"Why are you asking this?"

"Take the rope." Wang Xingguo pointed to the projectile dangling in mid-air and said.

"One meter seven!"

"One meter seven minus 40 centimeters is one meter three, the height arm length of one meter seven is about 65 centimeters, one meter seven six minus 40 centimeters is one meter thirty-six, plus one meter ninety-five is three meters three one, huh...... It should be enough! Wang Xingguo counted a large number of numbers that Xia Ruobing didn't understand, and before Xia Ruobing could react, he asked again, "How many do you weigh?" I want real data. ”

"What do you mean? Are you going to ask me about my measurements next? "Height and weight, this is a girl's private data, how can you tell people casually?

"Hurry up, I've got a plan, but I need to know your weight." Wang Xingguo said, his eyes still looking directly at the dangling projectile.

"You...... What the hell do you want to do? Xia Ruobing was furious.

"The projectile is about three meters two from the ground, I will push you up, you stand on my shoulder, get the projectile and pull the rope down, I have to keep my balance when I push you, the heavier it is, the harder it is for me to maintain, if it exceeds my limit, I will find another way, squats and presses to maintain balance, my limit is 60 kilograms...... Maybe 65 kilograms......" Wang Xingguo said, this is not a gym to lift a barbell, jacking up a big person more than one meter tall, the balance is a little poor, and it will be troublesome to break Xia Ruobing.

"I ...... 50 kilograms......" Xia Ruobing said softly.

"Alright, then don't waste time!" Wang Xingguo squatted down and patted his shoulder, "You come up, squat first, and then stand up slowly, huh...... If not, don't hold on, I can protect you if you jump down. ”

"Really?!" Xia Ruobing's eyes widened, "Can't think of any other way?" ”

"Is there any other way I need to work so hard? Hurry up! Wang Xingguo urged.

"Okay......" Xia Ruobing looked around, the bulge was more than a meter away from the cave wall, and she couldn't rely on the wall if she wanted to, and there was no long pole to reach, she climbed up Wang Xingguo's shoulder slowly, but it was really not easy to maintain balance on her shoulder, Wang Xingguo had to grope with her hand, trying to find Xia Ruobing's belt, and this hand touched Xia Ruobing's waist.

"What are you doing? Messing around with what? Xia Ruobing shouted, almost jumping off Wang Xingguo's shoulder.

"Miss...... Don't move...... I'll go ......" Xia Ruobing didn't have a belt, Wang Xingguo had to grab the elastic band of her pants, just now Xia Ruobing dodged like this, and the weight suddenly stepped on the left shoulder, which made Wang Xingguo grin.