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ffocate, and when they no longer hold their breath, they must begin to add oxygen to the lungs, that is, ventition. Sihe lungs are in a vacuum state during breath-holding, Therefore, the first step of ventition is to take a deep breath through the nose, and then exhale naturally through the nose. The sed step of ventition adopts natural breathing. After several natural breaths, the lungs get the supply of oxygen again. Then a new round of breathlessness begins. For a new round of breath-hol
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