2 has existed since ancient times, and 2' s culture came into being with the development of human history. In ancient China, the army needed two things: symbols and orders. Scholars can't give lectures without 2. No one has ever 1 given himself a lecture or asked himself a question, and no scholar has ever asked himself a question. A king needs two things to govern a country. He heard about it at court and made an in-depth investigation. ..... In short, 2 plays a huge role in China literature. Since Pangu, two people have been created, a man and a woman. Since Qin Shiwang, the six countries have been unified, left and reunified, and people have two kinds of thoughts. With the establishment of 1949 new China, history has changed, and people have two concepts: old and new. ..... Times are two changes. Now it's 20 10. The new generation won't. The difference between two centuries. There are two meanings, one is positive and the other is negative. When derogatory, it is used to describe a person who is simple-minded and stupid in action. When commending, describe a person as unique and fashionable, cute ~ humorous ~ elegant ~ there is a saying called "very 2 very radiant". The number 2 is the most active in nature. It always appears in the natural science we study and in our life. Chemical formula: The chemical formula of many elemental gases on the earth is X2, which is composed of two X atoms. O2, N2, H2, Cl2, F2 ... many, many. There are many things in our bodies that also appear in pairs. You can also find a lot from top to bottom: brain: left brain VS right brain. Eyes: left eye to right eye. Hand: left hand PK right hand. There are too many such examples, ............. To sum up, 2 is a very balanced number! If there is no opposition between left and right, I'm afraid people can't even stand still. 2 is still symmetrical. A piece of paper folded in half presents us with two identical worlds. No matter whether it is an insect or a mammal, the number of legs must be a multiple of 2, otherwise how can we survive? The mirror also shows us two consistent worlds. Some grammars in English embody some special meanings of 2. For example, I already have two apples. If I want a third apple, I must use the second ...................................................................................................................................................... 2, which is a fence from singular to plural. Have you ever wondered why two people fall in love? Two people, in everyone's subjective consciousness, living with only one "TA" and "I" will increase the sense of security for love in one's eyes. Imagine if three people kiss, each person must kiss twice, a total of three times. Are you tired? Two people always need to kiss 1 time, which is the best choice arranged by God for mankind. With all that said, why can't three people get married? Because there are only two sexes in human beings! (excluding shemale). According to the principle of pigeon hole, if two sexes are regarded as drawers and three people are regarded as objects, then there must be more than two homosexuals. By the way, the "2" given by God has two sexes. If human beings have three sexes, reproduction is worth discussing. There are many opposites in nature in ................................................................................................................................................................. There are two kinds of magnetic poles, N and S, gender and charge,+and-,and even matter can be divided into two kinds, positive matter and antimatter (which may be a bit far-fetched). There are also binary stars in nature. There are yin and yang fish (the symbol of Tai Chi) in China, which are positive and negative, south and north, and many, many, many, many, many, many, many, many, many. Think about the computer you are using. The computer uses binary because the circuit has two states: on and off (short circuit on), that is, the current is divided into two states, yes and no, and the computer is made up of this little 1 and 0.