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.
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.
应用推荐