This sentence was originally the ancient way of keeping in good health, but now it has become an old-fashioned advertising word to introduce some tonics.

The ancients said, "The immortal absorbs the aura of heaven and earth and gathers the essence of the sun and the moon in order to live a long life." In fact, this sentence is well-founded. The so-called "heaven and earth are nothing but gas fields" refers to the weather (air) and the earth's atmosphere. The weather is sunny, and the ground gas is cloudy. Everything is formed by the interaction between weather and atmosphere. Su Wen's theory of yin-yang correspondence says: "The weather is connected with the lungs, and the earth-qi is connected with phlegm." "Follow the spirit of Yin and Yang and respect the folk houses". "People still live between two gases, and they will live longer if they are obedient." As can be seen from the above, the two gases of heaven and earth are good for human body. Look at our city again. In the blink of an eye, a world of reinforced concrete, even the earth is deprived of the right to breathe. Where is the gas? Not to mention, the air has become toxic. ; "The essence of gathering the sun and the moon" is simply oxygen, the most basic element to maintain our lives, which is processed by the sun and the moon (all of them have been studied in physics class).