I immediately took a few deep breaths and calmed down the excitement that had suddenly become because I found the way to crack it: "Okay, I'll explain it to you." This was made in ancient times, right, you should know, right? The most precious metals of antiquity were not gold and silver, but tin. Because tin was very difficult to smelt out at that time, the price was unusually expensive, and naturally only the royal family and nobles could afford it. Tin is much softer than iron or something, just like the tin foil we use for barbecue, you see how hard it can be. Just that punch I just made, you see, there's a little mark here, right? I guess this board is probably made of tin. I pointed to a spot on the tin plate above my head to show him.

"But although this tin plate is a little thinner - compared to the thickness of the modern iron plate, it is actually relatively thick, at that time such a plate did not know how much it was worth, it is estimated that this is called King Jing wants to show it, although I don't know much - but it is not to the extent that the tin foil can be directly destroyed with bare hands."

"While it's true that the way I've just struck it for a long time might break the blocked tin plate, the sound it makes, you've just experienced, will definitely attract the attention of any creature that exists in the vicinity. It's dangerous, and it's irrational. Let's do it another way. For example, with a scrape. I "hehe" smiled, "Anyway, this thing is less hard than most things, we just need to use ordinary stones, we can destroy it by scratching it for a long time, and be careful not to make too much noise if you press it with your hand." How's that, your sister is smart, isn't she? ”

The younger brother pouted. I can't stand the way I look at this stinky fart: "I also studied chemistry well, I know what you said." ”

"But you didn't guess? And aside, when it comes to tin, I'm sure I know better than you -- your chemistry books probably only write about it on two or three sides, but I've spent two whole years making all sorts of circuit boards out of solder. Cantgetridofit。 After speaking, he pointed his nostrils to his brother's face in an absolutely victorious gesture, "You should be straightforward and honest, and admit that your sister and I are indeed very smart!" ”

My brother gave me a blank look, didn't speak, and looked down for a stone.

I shrugged my shoulders uninterestingly. He also began to look down for stones—what an awkward adolescent child.

Soon. We each found the right stone and worked together to scrape it on the tinplate.

"But it's time-consuming...... This board isn't as thin as you say, doesn't it look? Anyway, can't we just hit it with a stone while holding the board with one hand? Anyway, if you hold on to the board, you can prevent it from making a loud noise like the one just now. "It's easy to be sour with your hands all the time holding stones, and my brother has changed his hands countless times, so he can't help but complain.

"Don't you think you're complaining a lot here?" I looked at him a little speechless. The work at hand did not stop. "Do you think you're saving your stamina by smashing it directly? And this board is so thick. In addition to deforming the board, it is actually difficult to really smash it. As I said earlier, it takes a 'long time' to break the tin plate...... Let's speed up and grind. Try to grind it through quickly. After saying that, I dropped the stone in my hand again, "I don't think this one is very useful?" …… It's not sharp enough, I'll change it. ”

"You see, we've been grinding for a while before we have a little layer of skin...... How long will this take? The younger brother couldn't help but stop and rubbed his sore arm.

"But since you can grind off a layer of skin, it proves that this method is really effective?" I replied without looking up as I looked for a suitable stone on the ground, "And we've only been around for less than ten minutes, okay...... I've been watching it with my phone. ”

"But how could ancient people know about hardness? Surely this is not the way to open it, right? We've definitely overlooked something. The younger brother said, holding his chin and thinking again.

"Our ancestors know a lot more than you think." I ignored him, and when I found the stone I wanted, I went back to my original position and continued grinding against the tin plate.

"Sister, you say, the people will definitely not know about this kind of thing. Are there any peculiarities of tin that can only be known by the nobles, but impossible for the ordinary, poor people who even come to rob the tombs? The younger brother asked, his expression deep in thought.

"Yes, like low hardness, the people will never know." I replied casually, "If the tomb robbers at that time had really been able to break through the guarded soldiers, I guess they wouldn't have guessed that this baffle was a 'magic board' that seemed hard but was actually soft that could be directly ground with stones." ”

"Be serious and help me think about it." My brother stared at the back of my head speechlessly, and reluctantly picked up his own stone again and came to me to start grinding again, "Anyway, you don't need to use your brain to grind this kind of thing, right?" Haven't you been in contact with tin for two years and know it well? ”

"Yes, after two years of contact, it will melt under the electric soldering iron of more than 300 degrees, and it will gradually turn into powder in the external environment of more than 10 degrees minus. But neither of these situations could be controlled by the ancient people, could they? I replied casually, and then my heart suddenly moved.

"Negative ten degrees will turn into powder!!" He and I shouted at the same time, and then we looked at each other, and we both saw a deep smile in each other's eyes.

"Maybe the ancient people couldn't do it, but can we use it this way?" My brother laughed and punched me lightly on the shoulder, "I'll tell you that there are other easier ways, there's no need to wear out your hands like this." You see I'm right, right? I remember you had that plug-in mini refrigerator on you, didn't you? What is that minimum temperature? Let's plug it in with a power bank and it should work, right? ”

"Yes, yes, yes, yes. I do have one of these refrigerators with me, and I always use a power bank plugged in to keep medical ice cubes in at any time. It can be used now, but there are two problems--" I pointed to the bag on my back, "number one, we are still wearing a layer of antibacterial clothing, and I can't open it and take it out again...... How does this work? Second, the minimum temperature of this one is only about 0 degrees, and in most cases it may not even reach zero degrees, how can we use it to change the properties of tin? …… Well, the second question was one of the more extreme solutions that I had already thought of when I first uttered the phrase 'it will gradually turn into powder in an external environment of minus ten degrees,' although I can't guarantee the success rate of implementation." )