What is neutral gas and what does it mean?

Harmony is harmony. Traditional Chinese medicine generally refers to the qi of spleen and stomach in middle energizer and the physiological functions of digestion and transportation of food by spleen and stomach and other viscera, such as ascending and descending turbidity, also known as qi of spleen and stomach. Opera singing refers to the amount of breathing. When singing, the amount of breathing is large and can be controlled freely, which is called "moderate qi foot". According to the solar terms of the lunar calendar, every 30 degrees is a neutral gas from the solstice of winter. The lunar calendar divides a year into twelve qi periods and twelve middle qi periods, among which the middle qi periods are: rain, vernal equinox, Grain Rain, Xiaoman, summer solstice, great summer heat, intense heat, autumn equinox, first frost, light snow, winter solstice and great cold.