Abu didn't have time to study how the mechanism of the wooden bed was designed, but he did see that there was indeed a large iron box hidden under the bed board that Yelu Chu had opened. It turned out that the mechanism was really going to be opened from above. The reason why this iron box cannot be opened from below is that the circle around it is all wrapped by iron rods, and the top of the box is still hooked by the iron ring above, and there is no way to pull it out.

"No wonder I couldn't pull it out just now, it turned out that someone had done it by someone, how could it be pulled out when the iron ring and iron rod were all fixed! But this Yelu Bao Qianli still underestimates us too much, the mechanism on this bed has been cracked so easily by me, virtuous brother, let's open this iron box and take a look! The box is hidden so secretly, and this machine bed is specially set up for it, and the contents are definitely not ordinary. Yelu Chucai said excitedly.

"Big brother is really a good means, the mechanism of this wooden bed was so easily cracked by you. But I look at the iron box, there must be a layer of mechanism on top of it. Look at the iron lock on it, there are some strange symbols, which should be the key to cracking it! Big brother was so lucky to be able to crack the mechanism of this wooden bed just now, so it shouldn't be difficult to crack this iron box this time, right? Abu deliberately teased.

"Oh? Is it? Is there a mechanism on this iron box? Why are you still stunned, why don't you hurry up and carry this iron box out of it for me, the official will personally crack the mystery in this box. Yelu Chu rolled up his sleeves and was eager to try.

Sure enough, if you open the trap from above, the iron box can be easily carried out. A few strong men laid the heavy subway box flat on the ground for the two adults to look at.

Yelu Chu took great pains to circle around the iron box a few times to study some doorways, but it seemed that nothing was found, he still used brute force, trying to pry open the iron box directly, but the iron box was like a stone block that could be stretched into no gaps, exactly like the bed board just now, it can be said to be very exquisitely made. It seems that brute force is not working, he thought that he had just accidentally knocked on the bedpost to activate this mechanism, then this iron box may have the same mechanism, so he raised the iron box high above his head and prepared to drop it directly, if he could not activate the mechanism, maybe he could also break this iron box.

Just as he was about to do this, Abu came out in time to stop it, "Big brother, don't do this, this box can't be broken!" ”

"Why did Brother Xian say this?"

"Big brother, you put down the box first, and I'll tell you, you hold it high like this, I'm worried that you will throw this iron box to the ground if you miss. Yes, yes, big brother, slow down and don't break this box. ”

Only then did Yelu Chu obey Abu's command and slowly put the iron box on the ground, looking at Abu hoping to get the answer to do so.

Abu didn't answer, but bent down, looked carefully at the strange symbols on the iron box, and then looked at the two mechanisms on each side of the iron box that could be pressed down but did not have the slightest reaction, and did not know what to use.

Abu got up and pinched his chin to analyze it, and he said to Yelu Chucai: "Big brother, this iron box is indeed organized, we can't open it so roughly. It must be not easy for Yelu Bao Qianli to hide in such a secret place. If we hadn't even looked at it and banged on it beforehand, it would have been too late to fix it if we broke the contents of it. ”

"Oh, Brother Xian, you reminded me right, I almost destroyed the treasure inside, so what do you say you should do now? I know that there is a mechanism but I can't crack it, it's really worrying. Yelu Chu said anxiously.

"Big brother, don't worry, let me see, maybe there is a way to crack it."

"Yes, yes, you are a master, you must have a way to crack this box, and this box will be handed over to you."

Abu first tried the two places on both sides of the iron box that could be pressed, and found that it did not cause any changes. He gently picked up the box and shook it a few more times, and found that there seemed to be a clanging sound inside, and something seemed to be rolling back and forth inside. It's like an iron ball! One will roll to the east and the other will roll to the west.

"Brother Xian, there seems to be something moving in here! I heard that. Yelu Chucai said excitedly.

"Well, big brother has a good ear, there is indeed an iron bead moving in it, if I guess correctly, this thing will open the key to the iron box." Abu looked closely at the pattern on the iron box, and indeed there was a bead drawn on it, and the position of the sound coming from the iron box was the same, following the indication of an arrow, there was a path to the other end of the iron box, and on the other end there was also a bead pattern, but on the other side there was no sound of the bead, what was the matter?

Yelu Chucai naturally didn't know the mystery of this iron box, he still insisted on using violent means to open this iron box, anyway, if they didn't open it to see what was going on, it would be difficult for the contents to see the light of day, so it was better to let him open it directly to find out.

Abu gradually had some ideas, recalling that when Lu Xiaoyu was exercising them before, he took something called Lu Ban Lock.

According to General Lu Xiaoyu, this Luban lock is an ancestral technique of his family, which originated from the mortise and tenon structure pioneered in ancient architecture. The concave and convex parts (i.e., mortise and tenon structures) inside this three-dimensional inserting device are meshed very cleverly. The original wooden structure is a perfectly fitting cross cube from the outside. There are many types of Luban locks, with different shapes and internal structures, and they are generally easy to disassemble and difficult to install. When assembling, you need to observe carefully, think carefully, and analyze its internal structure. It is good for the development of the brain, flexible fingers, and is a good educational toy.

There are various types of Luban locks, and they are strange. Among them, the most common Luban locks of six and nine are the most famous. Nine Luban locks, select a number of them, you can complete the "six tenons", "seven star knots", "eight buckles", "Luban locks". It is not easy to meet the different numbers of nine tenon shapes at the same time to achieve four occlusal structures.

Lu Xiaoyu gave them these Luban locks to exercise their brains, and it was also a good way to calm down and do something when they were irritable.

From this iron box, Abu saw the shadow of the Luban lock, and the structure of this iron box should be similar to the Luban lock. And this iron bead became a key to crack the complex structure of this iron box.