氧气运输系统只需铁原子便可运行，但血色素提供的蛋白质“笼状”结构能够大大提高其效率。
An oxygen transport system is possible with just the iron atoms, but it is very much more effective with the protein "cage" the structure of hemoglobin provides.
图 4 显示了蛋白质血色素的视图（图像提供了一对立体模型；见 参考资料）。
Figure 4 offers a visual look at the protein hemoglobin (image is a stereo pair; see Resources for the image source).
铁在能量的新陈代谢有重要的作用，是血色素组成的必需成分。能把血液里的蛋白质转化成氧。
Iron plays a key role in energy metabolism and is a necessary component of hemoglobin, the protein that transports oxygen in the blood.
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