? Charcoal desalination, as well as black and white mountains and parallel imports; Farmers worked hard to burn wood into charcoal, and then sold it in the market and changed it into daily necessities. In the past, salt was very precious in mountainous areas. Charcoal is black and salt is white. Charcoal is sold and salt is bought. Salt for charcoal, it is clear at this time. Charcoal is produced in the mountains and salt is steamed in water. Because they are all used for exchange, they are all commodities.

In short, sage books are suitable for all ages! The theory here can be understood as The Analects of Confucius, which has been circulated for thousands of years because of its brevity. As long as you are from China, whether you are past or present, whether you are an ordinary person, but a refined scholar, whether you are an elder or a persistent student, you should understand this truth. If you want to be a saint, you must read this Bible.

? In short, sage books are suitable for all ages! The "Tao" here can also be used to talk about the Tao Te Ching, which is Lao Tzu's rhetoric. Tao Te Ching has more than 3,000 words. In a word, different people have different opinions. I think a good couplet should be about artistic conception, explaining a truth clearly, not seeking equality and speaking naturally and fluently. Let's throw a brick to attract jade.