求翻译：在此之前，还经过一个肺循环，把血液中的二氧化碳排出，将空气中的氧气摄入，使最终进入全身大循环的血液中不但含有细胞所需的养份，还含有所需的氧气。是什么意思？

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Prior to this, it is a pulmonary circulation in the blood of 2 carbon dioxide emissions, the oxygen in the air intake so that the final entry into the body of the loop will not only contain cells in the blood of the required nutrients, it also contains the required oxygen.

Before then, but also passes through a pulmonary circulation, discharges the blood in carbon dioxide, takes in the air in oxygen, causes finally to enter the whole body big circulation not only in the blood includes the cell to have to raise the share, but also includes the oxygen which needs.

Prior to that, also after a pulmonary cycle, discharges of carbon dioxide in the blood, oxygen in the air intake, and eventually into systemic circulation of blood cells not only in necessary nutrients, also containing the necessary oxygen.

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