We often see the word "crossing" in science fiction films, which is one of the common themes of science fiction films, and the most impressive is the series of science fiction films such as "Star Trek" and "terminator" which are closely related to crossing.
Crossing is also one of the dreams of many people. With this black technology, people can not only cross back to become millionaires, but also easily change a person's future.
So, in the long history of mankind, has there ever been anything about crossing? Today, I'd like to introduce to you some famous cultural relics in history. Each of these relics looks like a crossing object, and there's no sense of disobeying it in modern times.
The first item is the crystal cup of the Warring States period. Actually, the crystal cup is a glass. I believe that people have seen strange things in their daily life. Glass, as a kind of cheap and good synthetic material, is widely used in daily necessities and handicrafts. However, more than 1000 years ago, the ancients did not know how to make glass and how to make the glass What about it? The problem has not been solved so far.