What does the third class in medicine mean in English?

Three days is 15 days, so English is translated into five days.

Please see below for details.

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The second chapter of Huangdi Neijing is "The Theory of Four Qi Taking Mind".

How to keep healthy in spring

How to plant it in summer

How to feed and harvest in autumn

How to raise and hide in winter

Adapting to the four seasons is the first rule of health preservation. The order of heaven is its essence.

It's four seasons, not four seasons. The tune is God. What matters is the level of God.

Gas, five days is called waiting, and three days is called gas.

What is qi? Five days for Hou, three days for Qi.

Climate is phenology, and it is the expression of things such as trees. Things will change in five days. After fifteen days, the natural qi of heaven and earth changed.

Human health should be able to keep up with the changes of qi, otherwise it will get sick. This is also a reflection of the concept of harmony between man and nature.

In ancient times, talking about qi was more about solar terms, that is, 24 solar terms.