Margarita took a carton of milk out of the milk crate, inserted a straw into the box and began to drink. When she finished drinking the milk, she put the straw plastic bag and straw in the milk carton. Liuzi Fenglai said: Straws and plastic bags are very useful, and I usually collect them. I was thinking about something else just now, but it didn't reach you. Now, they're in the milk carton though. Of course, it should be possible to come out!

He shook it vigorously for a long time, but the straw and plastic bag just didn't come out. Mizukawa Mizukawa had an idea and said, "I've done experiments before. Throw the pull tab out of it from the beer can, and as a result, the pull tab can come out of it. And if you throw the paper in it, you won't be able to get out. Isn't there an article about this? What causes this phenomenon? Yes, it's the shape of space. What do you think about this? Liuzifeng, I believe you will have something to gain through the experiment just now. Now, tell us about it.

Liuzi Fenglai did not shirk: I think the outlet of the milk carton is too small, while the outlet of the beer can is larger. Tabs don't fit in milk cartons, but straws and plastic bags do.

Enter the boost. The straw can enter the milk carton not because it naturally reaches the milk carton through its own movement, but because of the help of someone. Similarly, when the straw is to come out of the milk carton, an external force is required. In general, there are no external forces. There seems to be no other way than to destroy the milk cartons. And this approach is certainly not what we are going to discuss. This kind of situation where the object does not actively enter the space, I call it passive entry. Passive entry will correspond to the exit limit, which is what I just talked about.

Of course, it is undeniable that whether to enter or not is naturally related to the shape of the object that enters. The box is the polyhedron with the highest degrees of freedom of all polyhedra, and there is no one. Why not a cube? What is involved here is the second long line. You may remember that someone once came up with the concept of the longest line, so why don't I use the longest line? We know that the longest diagonal of a milk carton is the longest line. As long as the straw can fit in the milk carton, the longest line of the straw is smaller than the longest line of the milk carton. This way, the straw can be inside the milk carton. In this way, the milk carton can come out. I think the key to the object being able to come out is the second longest line of the object. If the second long line is greater than the longest line of the exit, then the object cannot come out.

Duenias retorted: It is true that the second long line is important, but the longest line of the object is also important. When the difference between the longest line of the object and the longest line of the milk carton is very small, one end of the object cannot reach the exit even if it moves frequently. This makes it difficult to remove the object without destroying the milk carton.

There are also straws that are inorganic and not conscious at all. So, for it there is no difference between active and passive movement at all.

Margarita said, "I'll say a few words as well." The first is the bending effect. What is a curved body? Plastic bags and straws are. As long as the bend enters the milk carton, no matter what the shape data of the bend is, the bend cannot escape the milk carton. Bending out of the milk carton involves a change of direction, which is basically impossible.

Mizukawa said: Everything has an end, and this is also true today. We'll see you here on a cloudy day.