1, as a special art form, duality is only a basic requirement in form. More importantly, it requires rich and profound ideological content to be expressed in the most refined language, or poetic language, in order to enlighten people's wisdom and delight people's hearts. This is why those couplets have been handed down from ancient times to the present.
2, it is a national quintessence, but it is the most popular, popular and special national quintessence among many national quintessences. It is really a household name and even indispensable.
It is good to say that it is a patent of China, but it is only a unique culture of China. But this metaphor is still a bit inaccurate. First, it has no patent significance in the economic field, and anyone can use it for free without paying taxes. Second, it is not limited to countries. Anyone who is familiar with Chinese in China can use it at will.