There is a good saying, just like the hammer throw we play. In the white land in winter, the ancients used this hammer to catch wild animals to eat.

There is also a saying that everything is hibernating and there is nothing on the earth.

The explanation of "winter" in Shuo Wen Jie Zi is: "Four seasons are enough." Winter is the end of all seasons.

Excerpted from Qu Limin's Health Wisdom in Huangdi Neijing