当动物及人类呼气时，他们不仅呼出气体，如二气化碳，也呼出细胞代谢产生的化合物。
When animals and people breathe out, they exhale not only gases that are not needed, such as carbon dioxide, but also compounds that result from the metabolism of cells.
呼气时腹腔快速收缩，像是在拍打脊骨一样，腹腔快速的提升并通过鼻子有力地呼出气体。
On the exhalation the abdomen rapidly contracts, as if to slap against the spine. The diaphragm rapidly rises and forcefully expels the breath through the nose.
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