The general meaning of this sentence is that during the year, the liver should be raised in spring and the body should be maintained. In summer, you should nourish your heart, and in long summer, dampness is the main qi, and the spleen of the human body should also be corresponding. The ancients pointed out that "long summer prevents moisture." Traditional Chinese medicine believes that dampness is yin evil and hurts yang, especially spleen yang. Because the spleen likes dryness and hates dampness, once it is damaged, it will lead to poor transport of spleen qi and obstruction of qi movement. Therefore, we should pay attention to diet and nourish the spleen and stomach in summer, lungs in autumn and kidneys in winter. Yang is raised in spring and summer, with less yang and long sun; Nourishing yin in autumn and winter makes the Taiyin qi gather, which is the gas reservoir of Shaoyin.