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The relationship between years and mathematics
The earliest way to write the word "nian" is that a person bears the image of mature grain.

Represents a harvest. Because cereal crops are usually cooked once a year, "Nian" is extended to the name of Nian. Year is a time unit based on the period of revolution of the Earth, and it is also the mathematical name of time calculation in mathematics, such as year, month and day.